Category: Kant

Animal Awareness: Aristotle, Galileo, Kant

This just over the trans0m from Edward Buckner. I have added my comments in blue.

Aristotle: Even if all animals were eliminated and thereby all perceptions (since only animals perceive), “there will still be something perceptible—a body, for example, or something warm, or sweet, or bitter, or anything else perceptible.”

BV: Evaluation of the above requires that we get clear about the sense of 'perceptible.' There are at least the following three senses:

1) X is perceptible1 =df it is logically possible that x be perceived.

2) X is perceptible2 =df it is nomologically possible that x be perceived.

3) X is perceptible3 =df x is able to be perceived by some sentient being.

I suggest that (3) is what we normally mean by 'perceptible.'  What (3) says is that for a thing to be perceptible, there must be at least one existing perceiver with the ability to perceive the thing.  On (3), then, Aristotle is mistaken. So on a charitable interpretation, he probably means something like (2): many if not most natural things are such that, if there were an able-facultied perceiver on the scene, one or more natural things would be perceived, and would be perceived as having in themselves such qualities as being warm, bitter, or sweet. Aristotle is a realist about what we now call secondary qualities.

Galileo: “tastes, odors, colors, and so on are no more than mere names so far as the object in which we place them is concerned, and that they reside only in the consciousness. Hence if the living creature were removed, all these qualities would be wiped away and annihilated.”

BV: Galileo Galilei (1564-1642) belongs to the modern period which he helped inaugurate, along with Rene Descartes (1596-1650).   The main point to note for present purposes is that Galileo reduces the sensory qualities that Aristotle viewed as properties of things themselves to perceiver-relative 'secondary qualities.' So if "living creatures were removed," then at least the secondary qualities would be "removed" along with them. That's quite the contrast with Aristotle.  The Stagirite is a realist about warmth, etc,; the Italian is an idealist about warmth, etc.

What would Kant’s view be? Does he think that if all perceiving beings ceased to exist, then appearances would cease to exist? But appearances, according to him, are things like trees and rocks. Does he then think that if all perceiving beings ceased to exist, trees and rocks, and all other non-sentient things, would cease to exist? We should be told.

BV:  Underlying Ed's questions is the question: Who or what is the knowing subject for Kant?  For Aristotle, the knowing subject is the concrete man embedded in nature, a hylomorphic composite in which anima forma corporis. For Kant, however, the concrete man, the man of flesh and blood embedded in nature, with both animal body and animal soul, is blosse Erscheinung, a mere appearance or phenomenon, and thus an object of knowledge, but not the subject of knowledge, i.e., not the knowing subject.  For Kant, the knowing subject is transcendental.  This is Kant's view whatever you think of it. It is undoubtedly fraught with difficulties, but my sketch is accurate albeit superficial. 

And so the answer to both of Ed's questions is in the negative.

Berkeleyan and Kantian Idealism: How Do They Differ?

The good bishop, as Kant called him, held that reality is exhausted by "spirits" and their ideas. Thus on Berkeley's scheme everything is either a spiritual substance or mind, whether finite or infinite (God), or else an idea 'in'  a  mind. Ideas are thus modes or  modifications of minds.  As such they do not exist independently of minds. That's what 'in' conveys. If everything is either a mind or an idea in a mind, then bodies are not substances given that a substance is an entity capable of independent existence.  Berkeley's ontology is thus a one (type of) substance ontology. This makes for a contrast with Descartes' dualism of substances, thinking and extended. 

Now the gross facts are not in dispute and no (sane) philosopher is in the business of denying them. So every sane person will agree that there are rocks and trees, tables and turnips. You haven't understood Berkeley if you think that he is an eliminativist about such things. That is why you cannot refute him by kicking a stone.  Anyone who thinks that he can be so refuted is utterly bereft of philosophical aptitude. The question is not whether there are bodies, trees and such; the question is what they are, and what the good bishop is telling us is that they are coherent, cohesive, bundles of ideas. Trees and such exist alright; it's just that their esse est percipi, their being/existence is (identically) their being perceived by some spirit.  

The standard picture assimilates Kant to Berkeley, as I wrote earlier:

P.F. Strawson and H. A. Prichard are exponents of this reading along with many others in the Anglosphere. The standard picture makes of Kant an inconsistent Berkeley who limits knowledge to appearances, these being understood as "mere representations" (blosse Vorstellungen), while at the same time positing an unknowable  realm of things in themselves.  Mere representations are assimilated to Berkeleian ideas so that when Kant states that we know only appearances, what he is telling us is that we know only the contents of our minds.

The standard picture shows a failure to grasp what Kant intends with his transcendental idealism. (Note, however, that whether Kant achieves what he intends is an entirely different question.)  When I taught Kant in the 1980s I used the following three-level schema in order to clarify what Kant means by 'appearance' (Erscheinung) when he is using it in his special transcendentally idealist sense.  There are at least three senses of 'appearance' in Kant. We may call them the manifest, the scientific, and the transcendental. The empirical embraces both the manifest and the scientific and stands opposed to the transcendental. Correspondingly, there are three senses of 'reality,' the manifest, the scientific, and the transcendental.   

Level One: We start with the ordinary 'manifest image' appearance-reality distinction. One day I was hiking Jacob's Crosscut along the base of Superstition Mountain. Off in the brush I espied what appeared to be some big black dogs. In reality, however, they were black bears as a closer look revealed.  This is a familiar sort of case. An initial appearance is shown to be a perceptual mistake, one correctable and in this case corrected by further perception.  The initial, non-veridical appearance was not nothing, but its 'reality' was merely intra-mental, a momentary private datum not amenable to public verification, or even ongoing private verification.  It was a mere seeming or semblance, an instance of what Kant calls Schein and distinguishes from Erscheinung.  Kantian appearances are not private mental data. 

Let 'A1' denote an appearance at Level One, and 'R1' a reality or real thing at Level One. An A1 may or may not be veridical. If I jump back from what I take to be a snake but is in reality a tree root, then the A1 is non-veridical. But when I see a tree root and my partner confirms that what I saw was a tree root, then my A1 and his numerically different A1 are veridical.  So an A1 need not be illusory.  Every A1 purports to be of or about an R1, but the purport does not always 'pan out.'

At A 45 = B63, Kant gives his rainbow example. He tells us that a rainbow may be called a mere appearance and the rain the thing in itself.  This is an example of the Level One appearance-reality distinction. In that same obscure passage,  the careful reader can discern the Level  Three appearance-reality distinction.  For he tells us that the rain drops, together with such primary qualities as shape,  are themselves appearances of a "transcendental object" that "remains unknown to us."  It follows that the rainbow is an appearance of an appearance. The empirical object (rain water refracting sunlight) that is the reality behind the rainbow is itself an appearance of something that does not appear to us as it is in itself.

Level Two.  We now wheel the primary versus secondary quality distinction onto the field. An R1 at Level One has both primary and secondary qualities.  The tree I see when I look out my window has both primary and secondary qualities. To mention just two of its primary qualities, it has a size and a shape. To mention just one of its secondary qualities it is green in color.  At Level Two, R1 is stripped of its secondary qualities, and left with its primary qualities alone. We are now operating within the 'scientific image.'  What was R1 at Level One is now A2 at Level Two.  The real extra-mental tree of Level One is now taken to be an appearance of a deeper reality R2 at Level Two.  Thus:

A1 ——————-> R1 

                                       (R1 = A2) ——————–> R2

                                              

A1 is a representation 'in' the mind of a psychophysical being, a human animal for example. The arrows stand for the representing relation. There is difference between the two relations depicted, but I cannot go into this now. What A1 represents (or presents, stellt vor) is an empirical object R1 endowed with primary and secondary qualities. The secondary qualities are perceived at the object even though, at Level Two, they are understood to be merely relational properties of R2 due to the affection (causal impact) of the thing R2 upon the sensory receptors of the psychophysical subject.  Thus R2 in itself is not colored, etc.  But R2 is in space and possesses a location, a size, a shape, a volume, etc. It is either at rest or in motion which implies the possibility of translation and rotation, etc. which motions bring  objective time into the picture.  

Level Three.  At this level we arrive at the phenomenon or appearance in the specifically Kantian sense. Space and time (and thus all primary qualities) are now stripped from R2 and made out to be a priori forms (or schematizations of such forms), forms that characterize the standpoint of an ectypal intellect, one whose sole mode of intuition (Anschauung) is sensible and thus receptive unlike the intellectual and thus non-sensible mode of intuition of the archetypal intellect whose intuition is creative of its objects.  What exactly this standpoint of the ectypal is is a vexing question. We can say this much with assurance: it is nothing internal to the mind of a psychophysical being such as a human animal, nor is it necessarily dependent on the existence of psychophysical beings.  Extending the above diagram:

 

(R1 = A2) ——————–> R2

                                                    (R2 = A3) ———————–> R3 (negative noumenon)

(R2 = A3) is an intersubjective object.  It is the objective correlate of the epistemic standpoint of an ectypal intellect.  Nature for Kant is the sum-total of all such phenomena as intersubjective objects. The objectivity of R3, by contrast, is not intersubjective but absolute as befits the objective correlate of the absolute mind of the archetypal intellect, "which all men call God," to adapt a phrase from Aquinas.

The above schema leaves us with a lot of thorny questions.  One such concerns double affection (Erich Adickes). Do both R3 and R2 cause sensations in psychophysical beings?

The main point, however, it is that no one who understands what Kant is trying to do could possibly assimilate his idealism to Berkeley's. There is much more to be said.

Nota Notae Est Nota Rei Ipsius, Kant, and the Ontological Argument

This is a re-post, redacted and re-thought, from 22 July 2011. I dust it off because something caught my eye the other morning in the Translator's Introduction to Kant's Logic. Robert S. Hartman and Wolfgang Schwarz tell us that for Kant the principle of all inference or mediate judgment is the rule Nota notae est rei ipsius nota. (p. xlii). I'm guessing that C. S. Peirce got wind of the principle from Kant. As for Hartman, I remember hearing good things about him and his work in axiology from Hector-Neri Castañeda. I also recall Hector saying that Hartman died young. Details of Hartman's eventful life here. He died at age 63, which is young for a philosopher.  Hector died at 66.

……………………………………………………………….

"The mark of a mark is a mark of the thing itself." I found this piece of scholasticism in C. S. Peirce. (Justus Buchler, ed., Philosophical Writings of Peirce, p. 133) It is an example of what Peirce calls a   'leading principle.'

Let's say you have an enthymeme:

   Enoch was a man
   —–
   Enoch died.

Invalid as it stands, this argument can be made valid by adding a premise. (Any invalid argument can be made valid by adding a premise.) Add 'All men die' and the argument comes out valid. Peirce writes:

     The leading principle of this is nota notae est nota rei ipsius.
     Stating this as a premiss, we have the argument,

     Nota notae est nota rei ipsius
     Mortality is a mark of humanity, which is a mark of Enoch
     —–
     Mortality is a mark of Enoch.

But is it true that the mark of a mark is a mark of the thing itself? There is no doubt that mortality is a mark of humanity in the following sense: The concept humanity includes within its conceptual content the superordinate concept mortal, which implies that, necessarily, if anything is human, then it is mortal. But mortality is not a mark, but a property, of Enoch. I am invoking Gottlob Frege's distinction between a Merkmal and an Eigenschaft. Frege explains this distinction in various places, one being The Foundations of Arithmetic, sec. 53. But rather than quote Frege, I'll explain the distinction in my own way using a totally original example.

Consider the concept bachelor. This is a first-order or first-level concept in that the items that fall under it are not concepts but objects. The marks of a first-order concept are properties of the objects that fall under the concept. Now the marks of bachelor are unmarried, male, adult, and not a member of a religious order. These marks are themselves concepts, concepts one can extract from bachelor by analysis. Given that Tom falls under bachelor, he has these marks as properties. Thus unmarried, etc. are not marks of Tom, but properties of Tom, while unmarried, etc. are not properties of bachelor but marks of bachelor.

To appreciate the Merkmal (mark)-Eigenschaft (property) distinction, note that the relation between a concept and its marks is entirely different from the relation between a concept and its instances. A first-order concept includes its marks without instantiating them, while an object instantiates its properties without including them.

This is a very plausible line to take. It makes no sense to say of a concept that it is married or unmarried, so unmarried cannot be a property of the concept bachelor. Concepts don't get married or remain single. But it does make sense to say that a concept includes certain other concepts, its marks. On the other hand, it makes no sense to say of Tom that he includes certain concepts since he could do such a thing only if he were a concept, which he isn't. But it does make sense to say of Tom that he has such properties as being a bachelor, being unmarried, being an adult, etc.

Reverting to Peirce's example, mortality is a mark of humanity, but not a mark of Enoch. It is a property of Enoch. For this reason the scholastic formula is false. Nota notae NON est nota rei ipsius. The mark of a mark is not a mark of the thing itself but a property of the thing itself.

No doubt commenter Edward the Nominalist will want to wrangle with me over this slight to his scholastic lore, and I hope he does, since his objections will aid and abet our descent into the labyrinth of this fascinating cluster of problems. But for now, two quick applications.

One is to the ontological argument, or rather to the ontological argument aus lauter Begriffen as Immanuel Kant describes it, the ontological argument "from mere concepts." So we start with the concept God and analyze it. The concept God includes omniscience, etc. But 'surely' existence is also contained in the concept God. For a god who did not exist would lack a perfection, a great-making property; such a god would not be id quo maius cogitari non posse. He would not be that than which no greater can be conceived. To conceive God, then, is to conceive an existing God, whence it follows that God exists! For if you are conceiving a nonexistent God, then you are not conceiving God.

Frege refutes this version of the ontological argument — not the only or best version I hasten to add — in one sentence: Weil Existenz Eigenschaft des Begriffes ist, erreicht der ontologische Beweis von der Existenz Gottes sein Ziel nicht. (Grundlagen der Arithmetik, sec. 53)  "Because existence is a property of concepts, the ontological argument for the existence of God fails to attain its goal." What Frege is saying is that the ontological argument "from mere concepts" rests on the mistake of thinking of existence as a mark of concepts as opposed to a property of concepts.  No concept for Frege is such that existence is included within it. Existence is rather a property of concepts, the property of having an instance.

The other application of my rejection of the scholastic formula above is to the logical question of the correct interpretation of singular propositions. The scholastics treat singulars as if they are generals.  But if Frege is right, this is a grave logical error since it rides roughshod over the mark/property distinction. To drag this all into the full light of day would take many more posts.

What Does Kant Mean by ‘Appearance’?

This from the Comments. The numerals are my intercalation.

But the question remains, exactly what does Kant mean by ‘appearance’ (Erscheinung)? [1] Can I speak of this Appearance? [2] Is this Appearance the visible surface of my desk? [3] Is it numerically identical to what F sees when she looks at the desk? (Surely it is, since you claim it is “public, intersubjectively accessible” – and [4] in what passage does Kant say that Appearances are ‘public’ and ‘intersubjectively accessible’? What are the German terms corresponding to the English?)

Ad [1]. Yes, in the same way that you can speak of your desk or this desk. 

Ad [2]. No, the appearance or phenomenon is the empirically real desk itself with all its parts (and their parts . . .) and properties.  Notice that I wrote 'desk itself,' not 'desk in itself.'  The desk itself is a phenomenon, not a noumenon; it is an empirically real object of "possible experience" (moegliche Erfahrung). The visible surface you see is not identical to the desk itself.

Ad [3].  The desk itself is a Kantian phenomenon and therefore intersubjectively accessible via outer perception. So when F is in your study, she sees the same desk that you see. But your mental states are numerically different from hers, and hers from yours.  Your epistemic access is via your mental states and her access is via hers. You can introspect yours but not hers and vice versa. If A1 is your act of visual perceiving at time t, and A2 is her act of visual perceiving at time t, then it is obvious that A1 is not identical to A2.  It should also be obvious that what A1 presents to you and what A2 presents to her are typically different aspects of the same desk.  Suppose you are looking at the desk from above and she is underneath the desk looking up at its underside.   

Since 'appearance' is causing you confusion, let's use 'phenomenon.'  The Kantian  phenomenon is the desk with all its parts and properties. But this one desk appears differently to you and your wife.

Ad [4].  Carefully read section 32 of the Prolegomena.  There we learn that appearances = things of sense = phenomena. Phenomena are sensible things such as your desk. They are full-fledged denizens of the mundus sensibilis. Phenomena are the empirically real objects of sensory intuition (Anschauung).  They are obviously public in that two or more empirical subjects can have knowledge of one and the same phenomenon such as your desk. The main thing here is that phenomena are not private mental data. It therefore should be obvious that Kant is not promoting a form of subjective idealism. The world of phenomena for Kant is an intersubjectively knowable world.  

Study also Prolegomena, section 13, Remark II wherein Kant explains why he is not an idealist.

And then there is CPR A45-46/B62-63.  Do you have the Akademie Ausgabe in your library? If so, check out Ak. XX, 269. That's a passage from Fortschritte.

The Standard Picture of Kant’s Idealism

This entry draws on Henry E. Allison, Kant's Transcendental Idealism: An Interpretation and Defense, Yale University Press, 1983. "According to the standard picture, Kant's transcendental idealism is a metaphysical theory that affirms the unknowability of the 'real' (things in themselves) and relegates knowledge to the purely subjective realm of representations (appearances)." (p. 3)  P.F. Strawson and H. A. Prichard are exponents of this reading along with many others in the Anglosphere. The standard picture makes of Kant an inconsistent Berkeley who limits knowledge to appearances, these being understood as "mere representations" (blosse Vorstellungen), while at the same time positing an unknowable  realm of things in themselves.  Mere representations are assimilated to Berkeleian ideas so that when Kant states that we know only appearances, what he is telling us is that we know only the contents of our minds.

The standard picture opens Kant to the devastating objection that by limiting knowledge to appearances construed as mental contents he makes knowledge impossible when his stated aim was to justify the objective knowledge of nature and oppose Humean skepticism. Allison reports that Prichard "construes Kant's distinction between appearances and things in themselves in terms of the classic example of perceptual illusion: the straight stick that appears bent to an observer when it is immersed in water." (p. 6)  But then knowledge is rendered impossible, and Kant is reduced to absurdity.

Anyone who studies Kant in depth and in context and with an open mind should be able to see that his transcendental idealism is not intended as a subjective idealism. A related mistake is to think that subjective idealism is the only kind of idealism. The "standard picture" is fundamentally mistaken. Appearances (Erscheinungen) for Kant are not the private data of particular minds, and thus not ideas in the Cartesian-Lockean sense, or any other sort of content of a particular mind. Kant distinguishes crucially between Erscheinung and Schein/Apparenz between appearance and illusion/semblance. Because of this distinction, appearances cannot be assimilated to perceptual illusions in the way Prichard and the "standard picture" try to assimilate them.

For Kant, the world of phenomena or appearances is a world of  public, intersubjectively accessible, objects.  If you don't understand this you will never understand what Kant is maintaining. So the straight stick lately mentioned is for Kant a phenomenon, a public object, not a private mental item, whereas its seeming bent is an illusory private content of those particular embodied minds who, because of accidental factors, are unable to perceive the stick as it is in empirical reality.

The publicly accessible objects of the outer senses are said to be "empirically real, but transcendentally ideal." To understand this signature Kantian phrase, one needs to understand two distinctions, that between the ideal and the real, and that between the empirical  and the transcendental. The ideal is that which is 'inside the mind' and thus mind-dependent whereas the real is that which is 'outside the mind' and thus mind-independent. The inverted commas signal that these phrases are not to be taken spatially. 

What is ideal is either empirically ideal or transcendentally ideal. The empirically ideal embraces the "private data of an individual mind." (Allison, p. 6) Included therein are what are normally taken to be mental contents and "ideas in the Cartesian-Lockean sense." The empirically real embraces the totality of public, intersubjectively knowable objects in space and time.  In a word, the natural world.  Kant's claim that he is an empirical realist, but not an empirical idealist, amounts to the affirmation that  that "our experience is not limited to the private domain of our own representations . . . ." (7).  It should now be perfectly obvious that Kant is not espousing a subjective idealism.  

The planets and indeed everything in nature are empirically real. What then could it mean to say that these objects are transcendentally ideal?  It is to say that they are subject to certain "epistemic conditions" — I borrow the phrase from Allison — that make possible our knowledge of them.  Kant is clearly committed to there being a set of epistemic conditions without which empirical knowledge of empirically real objects would not be possible. Now in my humble opinion, Kant's theory of these epistemic conditions leaves a lot to be desired and is indeed without one univocal sense.  But this is not the issue at present. The issue is solely whether Kant's intent is to affirm a form of subjective idealism. The answer is that he is not. That is not his intent despite the existence of some passages that invite a subjectively-idealist reading. The proof that Kant is not promoting a subjective idealism is that his epistemic conditions, whatever they are, are not psychological or physiological.  

A psychological condition is

. . . some mechanism or aspect of the human cognitive apparatus that is appealed to in order to provide a genetic account of a belief or an empirical explanation of why we perceive things in a certain way. [. . .] Custom or habit, as used by Hume in his account of causality, is a prime example of such a psychological condition. As is well known, Kant was insistent in claiming that, although the appeal to such factors may be necessary to explain the origin of our beliefs and perceptions, or even of our knowledge "in the order of time" (der Zeit nach), it cannot  account for its objective validity. In Kant's terms it can answer the quaestio facti but not the quaestio juris.  The latter is the proper concern of the Critique, and this requires an appeal to epistemic conditions. (Allison, p. 11)

It should now be quite clear that Kant is not promoting a subjective or psychological idealism. His project, or rather a large part of it,  is to secure the objectivity of our knowledge of nature in the teeth of Humean skepticism, and to do so without a deus ex machina, without bringing God into the picture as both Descartes and Berkeley do.  (The other main part of his project is to show that rationalist metaphysics is not a source of objective knowledge.) Whether Kant succeeds in his project is a further question. I don't believe he does.

But if the question is whether Kant is espousing a subjective or psychological idealism, the answer is a resounding No.

Idealism: Subjective, Objective, Transcendental

This from a recent comment thread:

I think we should all agree on what counts as ‘subjective idealism’. I characterise it as the view that the objects we commonly take to be physical objects are in some way, or wholly, mind dependent. This a reasonable interpretation of Kant.

Let's leave the interpretation of Kant for later. The definition on offer raises questions.

1) Does the 'in some way' render the definition vacuous? I see a tree. The tree exists whether or not I am looking at it. But while I am looking at it, the tree has the relational property of being seen by me.  This property depends on my seeing which is a mental act of my mind.  (An act is not an action, but an intentional, or object-directed,  experience.) So there is a way in which the tree is mind-dependent.  It is dependent on me for its being-seen. There is a whole range of such  properties. The tree is such that: it is deemed beautiful by me; falsely believed by me to be a mesquite; thought by me to have been planted too close to the house, thought by you to have been planted just the right distance from the house, etc.  

Or consider money. What makes a piece of paper or a piece of metal money? Obviously, money to be money, i.e., a means of exchange, depends on minded organisms who so treat it.

2) If, on the other hand,  physical things are wholly mind-dependent, then that presumably means that trees and such are dependent on one or more minds for all of their properties, whether essential or accidental, whether monadic or relational, and also dependent on minds for their very existence.  This leads ineluctably to the question as to who these minds are.  Surely the physical universe in all its unspeakable vastness does not depend on my mind or yours or any finite mind or any collection of finite minds.

So the question arises: has there ever been a subjective idealist (as defined above) among the 'name' philosophers?  George Berkeley, you say? But the good bishop brought God into the picture to secure the existence of the tree in the quad when no one was about:

Dear Sir, your astonishment’s odd
I am always about in the Quad
And that’s why the tree
continues to be
since observed by, Yours faithfully, God

If the other spirit in question is God, an omnipresent being, then perhaps his perception can be used to guarantee a completely continuous existence to every physical object. In the Three Dialogues, Berkeley very clearly invokes God in this context. Interestingly, whereas in the Principles, as we have seen above, he argued that God must exist in order to cause our ideas of sense, in the Dialogues (212, 214–5) he argues that our ideas must exist in God when not perceived by us.[20] If our ideas exist in God, then they presumably exist continuously. Indeed, they must exist continuously, since standard Christian doctrine dictates that God is unchanging. (SEP Berkeley entry)

Now if the ultimate subject of subjective idealism is God, who exists of absolute metaphysical necessity and who creates and ongoing sustains in existence  everything other than himself, then such an idealism is better described as objective. 

Kant's brand of idealism is neither subjective nor objective, but transcendental. What this means I will explain later. 

Hume and Kant on Sense Perception

Another round with Ed Buckner who writes,

Meanwhile I continue to struggle through Kant, and I point out what seems to be a fundamental and insuperable difficulty below. (I may be wrong).

Start with Hume, and with what he means by ‘impressions’. As I write, I am looking at what I take to be the black surface of my desk. Note “what I take to be”. Assume that what I take to be the surface is the surface. But what then does Hume mean by an ‘impression’? He says “Those perceptions, which enter with most force and violence, we may name impressions; and under this name I comprehend all our sensations, passions and emotions, as they make their first appearance in the soul”. Ideas are ‘the faint images’ of the impressions in thinking and reasoning.

This is not clear at all. By ‘impression’ Hume means either that which I (perhaps wrongly) take to be the surface of the desk, or something else. Suppose the former. Hume makes it clear that the impression makes its appearance in the soul, and it is clear from everything he says later that an impression is a mental item. But the desk is not a mental item, hence the surface of the desk is not a mental item. Which is absurd.

Or he means the latter. Then the ‘impression’ must be something other than what I take to be the surface of the desk. But I am aware of no such thing. In looking at the desk I am aware of nothing corresponding to a perception which enters “with force and violence”. Nor, when I shut my eyes and think of the surface of the desk, am I aware of anything but a faint memory of seeing the surface itself, rather than the faint image of any ‘impression’.

So both interpretations are problematic. Either my desk and its surface are mental items, which is absurd. Or it is impossible to say what Hume means by ‘impression’. So Hume’s position makes no sense.

I agree with the above analysis. It is clear and convincing. We can also display the problem in my preferred way as an aporetic polyad, in this case a tetrad:

1) Impressions are mental items.

2) The surfaces of physical things are not mental items.

3) What we know when we have sensory knowledge are impressions.

4) We have sensory knowledge of the surfaces of physical things.

These propositions are collectively inconsistent.  So at least one of them must be rejected. As I read Hume, he is committed to (1), (3), and (4), and so he must reject  (2). But this leads to a subjective idealism that both Ed and I find intolerable.  No physical thing such as Ed's desk is a bundle of sense impressions.  Sense impressions are 'in the mind' and no desk or part thereof is in anyone's mind.

The Humean solution is worse than the problem.  Another solution is to reject (3). One might hold a representational theory of mind according to which what we know via the outer senses are, in the typical non-illusory cases,  mind-independent things and some of their parts, but we know them via mental representations.  Enter the epistemic intermediary: contents in the mind mediate between mind and external thing.  

There are other putative solutions such as Husserl's and Butchvarov's. They too have their difficulties. I won't go into them because Ed hasn't read these philosophers.

The next question is whether Kant’s position makes any sense, given that his position here seems closely connected with that of Hume. He speaks of ‘sensible sensations’, ‘the world of the senses’, ‘the field of appearances’ etc etc. What does he mean by these terms? Does he mean the sorts of things that e.g. I take to be parts of material objects? But then it seems to follow from everything else he says that either material objects are mental items, or that I am wrong in thinking that what I take to be part of a material object, is in fact such. Both positions are absurd.

Have I misunderstood Kant? 

To assimilate Kant to Hume is a mistake. There are many crucial differences between the two. For one thing, Kant is not a subjective idealist. He does not hold that physical things are bundles of impressions.  He would reject (3) in the tetrad above.  To explain this is impossible in a few sentences.  I refer Ed to Kant's Letter to Marcus Herz, 21 February 1772 which may help. 

There is also the following excerpt from a different entry:

Kant
 
I think Ed is wrong above about Kant.  For Kant, the pure is the opposite of the empirical. Every concept is either pure or empirical and no concept is both. A pure concept is one that is not drawn from experience, ein solcher der nicht von der Erfahrung abgezogen ist, but originates from the understanding in respect of both form and content, sondern auch dem Inhalte nach aus dem Verstande entspringt. The form of all concepts, including pure concepts, arises from reflexion Reflexion, and thus from the understanding. Empirical concepts arise from the senses, entspringen aus den Sinnen,  by comparison of the objects of experience. Their content comes from the senses, and their form of universality, Form der Allgemeinheit, alone from the understanding.
 
If Buckner is telling us that Kant's pure-empirical distinction runs parallel to Zabarella's first intention-second intention distinction, then that can't be right. For Zabarella's animal and human being, which are first intentions for him, count as empirical concepts for Kant. 
 
Any comparison of Zabarella (1533-1589) the Aristotelian and Kant is bound to be fraught with difficulty because of the transcendental-subjective turn of modern philosophy commencing with Descartes (1596-1650).  For Aristotle, the categories are categories of a real world independent of  our understanding; for Kant, the categories are precisely categories of the understanding (Verstandeskategorien) grounded in the understanding both in their form and in their content.  The categories of Aristotle are thus objective, categories belonging to a world to be understood, and not subjective, categories whereby a mind understands the world.
 
Pure Concepts of Reason as Limit Concepts
 
Kant also speaks in his Logic and elsewhere of Ideas which are pure concepts of reason, Vernunft, and not of understanding, Verstand. Die Idee ist ein Vernunftbegriff deren Gegenstand gar nicht in der Erfahrug kann angetroffen werden. (Logik, sec. 3)  The objects of these pure concepts of reason cannot be known by us because our form of intuition, Anschauung, is sensible, not intellectual. We can know only phenomena, not noumena. Among these Ideas, which are plainly limit concepts, are God, the soul, the world-whole, and freedom. And they are not merely negative limit concepts. Free will, for example, is objectively real despite its not being obejctively knowable. But more on this later.

Dissertation Advice on the Occasion of Kant’s Birthday

Kant Sapere AudeImmanuel Kant was born on this date in 1724. He died in 1804. My dissertation on Kant, which now lies 44 years in the past, is dated 22 April 1978.  But if, per impossibile, my present self were Doktorvater to my self of 44 years ago, my doctoral thesis might not have been approved! As one's standards rise higher and higher with age and experience one becomes more and more reluctant to submit anything to evaluation let alone publication. One may scribble as before, and even more than before, but with less conviction that one's outpourings deserve being embalmed in printer's ink. (Herein lies a reason to blog.)

So I say to my young friends: finish the bloody thing now while you are young and cocky and energetic.  Finish it before your standards become too exacting. Give yourself a year, say, do your absolute best and crank it out. Think of it as a union card. It might not get you a job but then it just might. Don't think of it as a magnum opus or you will never finish. Get it done by age 30 and before accepting a full-time appointment. And all of this before getting married. That, in my opinion, is the optimal order. Dissertation before 30, marriage after 30. 

Now raise your glass with me in a toast to Manny on this, his 298th birthday. Sapere aude!

 Related: Right and Wrong Order

The Concept GOD as a Limit Concept

The concept GOD is the concept of a being that cannot be constituted in consciousness in Husserl's sense of 'constitution,' a being that cannot be a transcendence-in-immanence, but must be absolutely transcendent, transcendent in itself, not merely for us.  It follows that there cannot be a phenomenology of God. At best, there can be a phenomenology of such of our experiences as purport to be of or about God.

We know that the concept GOD is the concept of something absolutely transcendent, and we know this by purely conceptual means. We have the concept GOD and we analyze it: we simply unpack its meaning. Whatever the origin of this concept, it is there in us and available for analysis. Of course, we cannot learn by conceptual analysis that God exists, but we can know something about what God cannot be like, if he does exist.  We can know, for example, that God, if he exists, is not a concept.  No surprise here, and nothing that distinguishes God from my chair, since my chair is not a concept either.  (One cannot sit on a concept.)  The difference between the concept CHAIR and the concept GOD is the difference between an ordinary concept and a limit concept (Grenzbegriff).* 

This is the distinction between those concepts that can capture (mirror, represent) the essences or natures of the things of which they are the concepts, and those concepts that cannot. Call the first type ordinary concepts and the second limit concepts. Thus the concept CUBE captures the essence of every cube, which is to be a three-dimensional solid bounded by six square faces or sides with three meeting at each vertex, and it captures this essence fully.   The concept HELIOTROPIC PLANT captures, partially,  the essence of those plants that exhibit diurnal or seasonal motion of plant parts in response to the direction of the sun.  Concepts are mental representations.  Essences are extra-mental.

Now the concept GOD cannot be ordinary since this concept cannot capture the essence of God. For (i) in God essence and existence are one, and (ii) there is no ordinary concept of existence.

Ad (i). That in God essence and existence are one follows from the fact that nothing could count as the Absolute if it were a composite of essence and existence.  And we know by conceptual analysis that God is the Absolute: the concept GOD is the concept of 'something' absolute.  This is the case whether or not God exists.

Ad (ii).  When I say that there is no ordinary concept of existence, I mean that there is no ordinary (non-limit) concept that is adequate to existence. (There are bogus concepts of existence such as Quine's.) There is no ordinary (non-limit) concept of existence because the existence of a thing, as other than its essence, cannot be conceptualized.  Why not? 

This is because each existing thing has its own existence.  Thus the existence of Al is Al's existence, the existence of Bob is Bob's, and the existence of Carla is Carla's.  For the existence of a thing is that which makes that very thing exist.  Existence cannot be a property like being human, being sentient, being sunburned.  These properties are multiply instantiable; existence, however, is not multiply instantiable. There are no instances of existence.  

Now if each thing has its own existence, then existence is implicated in the irreducible singularity of each existing thing. Irreducible singularity, in turn, cannot be conceptualized by minds like ours which trade only in the general and multiply instantiable. It's an Aristotelian point. If Aristotle wrote in Latin it would go: individuum qua individuum ineffabile est. The individual as such, the singular as such,  is ineffable and cannot be conceptualized.  The Peripatetic tells us that science is never of the particular as particular but only of the particular as exhibiting general or repeatable features. The particular as such is unrepeatable.   But of course there are no individuals (particulars) bare of properties. Every finite individual is a this-such. This is a law of metaphyica generalis. So, while the individual as individual cannot be conceptualized, the individual as bearer of properties can be conceptualized as an instance of those properties.  If  I think of Mary as an instance of lovable properties, then I abstract from the haecceity (thisness) that makes her different numerically from her indiscernible twin Sherry.  So if I love Mary precisely and only as an instance of lovable properties, then it will make no difference to my so loving her whether Mary or Sherry is its object. It will, however, make a difference to Mary. "I want that you should love me for what makes me me, and not for what I have in common with her!"  I explain this all in great detail in Do We Love the Person or Only Her Qualities?

The crucial point here is that when we think of an individual as an instance of properties, we abstract from (leave out of consideration) the individual's thisness and its existence.  I am not saying that the existence and the thisness of a concrete individual are one and the same; I am saying that that they go together as a matter of metaphysical necessity.  

Ad (i + ii).  In God there is no real distinction between existence and nature. That was the first point. The second was that no ordinary (non-limit) concept captures the individuality of the thing of which it is the concept. Therefore, since God is (identically) his nature, there can be no ordinary concept of God, whence it follows frat GOD is a limit concept.

There is, then, a  clear sense in which God is unconceptualizable or unbegreiflich: he cannot be grasped by the use of any ordinary concept. But it doesn't follow that we have no concept of God.  We do. The concept GOD is a limit concept: it is the concept of something that cannot be grasped using ordinary concepts.  Our cognitive architecture is such that we can grasp only the general, the repeatable, but never the irreducibly singular.  The concept GOD, however, is the concept of 'something' absolutely and irreducibly singular.  God is one without a second, one without even the possibility of a second. Any god that doesn't satisfy this metaphysical exigency just isn't worth his salt.

The concept GOD is the concept of something that lies at the outer limit of discursive intelligibility, and indeed just beyond that limit. We can argue up to this Infinite Object/Subject, but then discursive operations must cease. We cannot penetrate the divine essence since this essence is one with existence, and existence cannot be conceptually penetrated. We can however point to God, in a manner of speaking, using limit concepts. The concept GOD is the concept of an infinite, absolute and wholly transcendent reality whose realitas formalis so exceeds our powers of understanding that it cannot be taken up into the realitas objectiva of any of our ordinary concepts.

Now if you have followed that, then you are in a position to see that the following objection is a 'cheap shot' easily dismissed.  "You contradict yourself. You say that God cannot be conceptualized but at the same time you operate with a concept of God as unconceptualizable."  But no contradiction arises once we distinguish ordinary from limit concepts. 

If the critic accuses me of inventing a distinction ad hoc to save the ineffability and transcendence of God, then my reply will be that there are numerous other examples of limit concepts.  See the aptly appellated category, Limit Concepts. 

________________

*The term Grenzbegriff first enters philosophy in 1781 in Kant's Critique of Pure Reason. Curiously, he uses the term only once in the works he himself published. The term surfaces a few more times in his Nachlass.  The sole passage in the published works is at A255/B311 where Kant remarks that the concept noumenon is a Grenzbegriff.

Among the Riddles of Existence

Among the riddles of existence are the riddles that are artifacts of the attempts of thinkers to unravel the riddle of existence. This is one way into philosophy. It is the way of G. E. Moore. What riddled him was not the world so much as the strange things philosophers such as F. H. Bradley said about it.  

If the Moorean way were the only way, there would be no philosophy. Moore was very sharp but superficial. Yet you cannot ignore him if you are serious about philosophy.  For you cannot ignore surfaces and seemings and the sense that is common. Bradley, perhaps not as sharp, is deep.  I am of the tribe of Bradley. Temperament and sensibility play major roles in our tribal affiliation as our own William James would insist and did insist in Chapter One of his Pragmatism with his distinction between the tender-minded and the tough-minded.

The entry to which I have just linked has it that the tender-minded are dogmatic as opposed to skeptical. Bradley, though tender-minded, is not. He is avis rara, not easily pigeon-holed. He soars above the sublunary in a manner quite his own.  On wings of wax like Icarus?  Like Kant's dove?  Said dove soars through the air  and imagines it could soar higher and with less effort if there were no air to offer resistance.  But the dove is mistaken.  The dove on the wing does not understand the principle of the wing, Bernoulli's principle.  Is the metaphysician  like the dove? The dove needs the air to fly. Can the metaphysician cut loose from the sensible and sublunary and make the ascent to the Absolute?

In the face of temperament and sensibility argument comes too late. 

Bradley and James seem to agree on the latterliness of argument. In the preface to Appearance and Reality, Oxford 1893, Bradley quotes from his notebook:

Metaphysics is the finding of bad reasons for what we believe upon instinct, but to find these reasons is no less an instinct. (p. x)

But why 'bad'? If I could speak to Bradley's shade I would suggest this emendation:  

Metaphysics is the finding of plausible, though not rationally compelling, reasons for what we believe upon instinct . . . .

Nietzsche too can be brought in: "Every philosophy is its author's Selbsterkenntnis, self-knowledge." 

As for Moore, is he the real deal? My young self scorned him. No true philosopher! He gets his problems from books, not from the world! The young man was basically right, but extreme in the manner of the young.   I have come to appreciate Moore's subtlety and workmanship.

Who is Caius?

Robert Paul Wolff here replies with wit and lefty snark to a charming request by one Pamela N., a personal assistant, who wants to know who Immanuel Kant is referring to when he writes, "Caius is a man; man is mortal; therefore, Caius is mortal."  Pamela confesses,

I will admit, I have not read Kant's works. I have, however, spent the last couple of hours combing through post after post after post about this particular quote from the book and cannot find a single soul who would say who they think Caius is.

In reading these many posts, I have come to the conclusion that Kant is probably referring to Pope Caius as he has been venerated by the Catholic Church as a Saint. Given that title, and the fact that Saint's [sic] are given to [sic] a quasi-immortal status [sic], I have ascertained that this is who Kant is most likely referring to. My question for you is, do you think that my assumption is correct? or do you have a deeper insight into who he is referring to?

Kant on Capital Punishment

Justice demands capital punishment in certain cases, and it doesn't matter what it costs, or whether there is any benefit to society, or even whether there is any society to benefit. Recall Kant's last man scenario from Metaphysics of Morals, Part II (emphasis added):

[6] But whoever has committed murder, must die. There is, in this case, no juridical substitute or surrogate, that can be given or taken for the satisfaction of justice. There is no likeness or proportion between life, however painful, and death; and therefore there is no equality between the crime of murder and the retaliation of it but what is judicially accomplished by the execution of the criminal. His death, however, must be kept free from all maltreatment that would make the humanity suffering in his person loathsome or abominable. Even if a civil society resolved to dissolve itself with the consent of all its members–as might be supposed in the case of a people inhabiting an island resolving to separate and scatter themselves throughout the whole world–the last murderer lying in prison ought to be executed before the resolution was carried out. This ought to be done in order that every one may realize the desert of his deeds, and that blood-guiltiness may not remain upon the people; for otherwise they might all be regarded as participators in the murder as a public violation of justice.

Kant's view in this passage is that capital punishment of murderers is not just morally permissible, but morally obligatory. (Note that whatever is morally obligatory is morally permissible, though not conversely, and that 'morally justified' just means 'morally permissible.')

Here is an interesting question. The U. S Constitution grants a near-plenary power of pardon to the president. (Here I go again, alliterating.) Does this extend to convicted mass murderers such as Timothy McVeigh? If yes, then Kant would not be pleased. The president would be violating the demands of retributive justice! This of course is a secular analog of the old theological problem of justice and mercy.

Memo to self: bone up on this!  See what Carl Schmitt has to say about it specifically. Cf. his Political Theology: Four Chapters on the Concept of Sovereignty, University of Chicago Press, 1985, p. 56:

All significant concepts of the modern theory of the state are secularized theological concepts not only because of their historical development—in which they were transferred from theology to the theory of the state, whereby, for example, the omnipotent God became the omnipotent lawgiver—but also because of their systematic structure, the recognition of which is necessary for a sociological consideration of these concepts. The exception in jurisprudence is analogous to the miracle in theology. 

Kant’s Letter to Marcus Herz, 21 February 1772

Herz marcusThe brief missive to Herz sheds considerable light on Kant's Critical project.  Herewith, some notes for my edification if not yours.

1) How is metaphysica specialis possible as science, als Wissenschaft? Having been awakened by David Hume from his "dogmatic slumber," Kant was puzzling over this.  It occurred to him that the key to the riddle lay in raising and answering the question:

On what ground rests the relation of that in us which we call representation to the object?

Representations 'in us,' i.e., 'in' our minds, are of or about objects 'outside of' our minds. What makes the representation of an object about the very object of which it is the representation? For example, what makes my visual awareness of a particular tree an awareness of that very tree?

There are three cases to consider.

2) If the representation in the subject is caused by the object, Kant thinks that an easy answer is forthcoming: the representation is of or about the object in virtue of its being caused by the object.  The tree, or the light reflected by the tree, affects my eyes, thereby causing in me a representation of that very tree.  We set aside for the time being the question whether this easy answer is a good answer.

3) We also have an easy answer to the above question if representations are active with respect to their objects, as opposed to passive as in the case of my seeing a tree. Suppose  the object itself were created by the representation, as in the case of divine representations. In cases like this, Kant tells us, "the conformity of these representations to the object could be understood." (82)

4) Now for the third case, the hard case. What are we to say about the pure concepts of the understanding, the categories? These conceptual representations, being pure, are not caused by sensation. But neither are they creative with respect to their objects. What then gives them objective reference? 

As pure concepts, the categories have their seat in our understanding. They are thus subjective conditions of thinking, not categorial determinations of things.  What gives these subjective conditions of thinking and judging — to think is to judge — objective validity?  That is the problem which Kant sets forth in his letter to Herz.  But he does not in that letter propose a solution.

5) He gives his solution in 1781 in the Critique of Pure Reason. Can I sketch it in a few sentences?

I touch a stone. I receive a sensation of hardness and warmth. No judgment is involved.  Judgment enters if I say, "Whenever the sun shines on the stone, it becomes warm." But this is a mere Wahrnehmungsurteil, a subjective judgment of perception. It lacks objective validity. It records one perception following another in a subjective unity of consciousness, as opposed to a consciousness in general.  The judgment does not record causation, assuming that causation involves necessitation, as Kant does assume. All we have at the level of perception are Hume's spatiotemporal contiguity of perceived events and their regular succession: the sun's shining on the stone followed by the stone's becoming warm.  Kant is of course convinced that there has to be more to causation than regular succession.

But if I say, "The sun warms the stone," then I make an Erfahrungsurteil, a judgment of experience which is objectively valid.  I am not merely recording a succession of perceptions, but an instance of causation in which the cause necessitates the effect.  The necessary connection is not out there among the things; it enters via the understanding's imposition of the category of cause on the sequence of perceptions.  The objective or transcendental unity of apperception, as the vehicle of the categories does the job. Just don't ask me how exactly. Here is where things get murky. This is what I wrote my dissertation on.

6) I am now in a position to answer in a rough way the question  of how the pure concepts of the understanding have objective validity. They have objective validity because the objects of experience are products of the categorial formation of the sensory manifold within a "consciousness in general," a transcendental, not psychological, unity of apperception.  It follows that the world of experience is an intersubjectively valid but merely phenomenal world and not a world of things in themselves.  The "highest principle of all synthetic judgments" is that "the conditions of the possibility of experience in general are at the same time the conditions of the possibility of the objects of experience themselves, and thus possess objective validity in a synthetical judgment a priori."

Since "the understanding is the lawgiver of nature,"  Human skepticism bites the dust, but so also does Leibnizian-Wolffian rationalism. This is because the Copernican revolution, at the same time that it validates  synthetic a priori  judgments in mathematics and physics for phenomena, restricts them to phenomena and disallows them for noumena such as God, the soul, and the world as a whole, the objects of the three disciplines of metaphysica specialis.

Unfortunately, Kant's system raises as many questions as it answers. But that is the fate of every philosophy in my humble opinion.  The dialectical nature of reason, which gives rise to dialectical illusion with respect to noumena, unfortunately infects everything we do in philosophy even when we draw in our horns and stick to phenomena.

Can Kant Refer to God?

This is a re-working of an entry from 19 September 2016.  It relates to present concerns about limit concepts and whether and to what extent God can be subsumed under our concepts.

……………………….

Ed Buckner raises the title question, and he wants my help with it.  How can I refuse?  I'll say a little now, and perhaps more later.

Kant Sapere AudeKant was brought up a rationalist within the Wolffian school, but then along came David Hume who awoke him from his dogmatic slumber.  This awakening began his Critical period in which he struggles mightily to find a via media between rationalism and empiricism.  The result of his struggle, the Critical philosophy, is of great historical significance but it is also an unstable  tissue of apparently irresolvable tensions. As a result there are competing interpretations of his doctrines.

I will propose  two readings relevant to Ed's question.  But first a reformulation and clarification of the question.  

Can one think about God and meaningfully predicate properties of him?  For example, can one meaningfully say of God that he exists, is omnipotent, and is the cause of the existence of the natural world?  Or is it rather the case that such assertions are meaningless and that the category of causality, for example, has a meaningful application only within  the realm of phenomena but not between the phenomenal realm as a whole and  a putative transcendent causa prima?  Are the bounds of sensibility (Sinnlichkeit) also the bounds of sense (Sinn), or are there senseful, meaningful assertions that transgress the bounds of sensibility?

Weak or Moderate Reading.  On this reading, we can think about God and meaningfully make predications of him, but we cannot have any knowledge of God and his attributes. We cannot have knowledge of God because knowledge necessarily involves the interplay of two very different factors, conceptual interpretation via the categories of the understanding, and sensory givenness.  God, however, is not given to the senses, outer or inner.  In Kantian jargon, there is no intuition, keine Anschauung, of God.  For intellects of our type, all intuition is sensible intuition.  The Sage of Koenigsberg will not countenance any mystical intuition, any Platonic or Plotinian visio intellectualis, at least not in this life.  That sort of thing he dismisses in the Enlightenment manner as Schwaermerei, 'enthusiasm' in an obsolete  18th century sense of the English term.

But while Kant denies that there is knowledge of God here below whether  by pure reason or by mystical intuition, he aims to secure a 'safe space' for faith:  "I have found it necessary to deny knowledge in order to make room for faith." (Preface to 2nd ed. of Kritik der reinen Vernunft, 1787, B xxx.)  Now if God and the soul are objects of faith, this would imply that we can think of them and thus refer to them even if we cannot have knowledge of them.

As for the soul, it is the object of the branch of metaphysica specialis called rational psychology. Since all our intuition is sensible, there is no sensible intuition of the soul.  As is well-known, Kant denies that special metaphysics in all three branches (psychology, cosmology, and theology) is possible as science, als Wissenschaft.  To be science it would have to include synthetic a priori judgments, but these are possible only with respect to phenomena.

Kant's key question is: How are synthetic a priori judgments possible?  He believes that they are actual in mathematics and physics, and would have to be actual in metaphysics if the latter were a science.  Kant concludes that  synthetic a priori judgments are possible in mathematics and physics only because the world of experience (Erfahrung) is not a world of things in themselves whose existence, nature, and law-like regularity are independent of our mental contribution, but a merely phenomenal world to whose construction (transcendental) mind makes an indispensable contribution. 

The dignity and necessity of the synthetic causal principle — every event has a cause — is rescued from the jaws of Humean skepticism, but the price is high: the only world we can know is the world of phenomena.  This is not a world of illusions, but a world of intersubjectively valid objects of experience. But while objective in the sense of intersubjectively valid, these objects do not exist in themselves. Things in themselves (noumena in the negative sense) are beyond our ken.  Yet we must posit them since the appearances are appearances of something (obj. gen.).  And it is presumably the affection of our sense organs by these things in themselves that gives rise to the sensory manifold that is then organized by a priori forms (categories and forms of sensibility) on the side of the subject.  The restriction of human knowledge to phenomena secures the objectivity (intersubjective validity) of our knowledge, but by the same stroke rules out any knowledge of the objects of special metaphysics (God, the soul, the world as a whole). 

On the moderate reading, then, Kant restricts the cognitive employment of the categories of the understanding to phenomena but not their thinking employment. We can think about and refer to the positive noumena, God, the soul, and the world as a whole, but we cannot have any knowledge of them. (And the same goes for the negative noumena that correspond to sensible appearances.)  We can talk sense about God and the soul, and predicate properties of these entities, but we cannot come to have knowledge of them.  Thus we can meaningfully speak of the soul as a simple substance which remains numerically self-same over time and through its changing states, but we cannot know that it has these properties.  

The weak reading is represented by the following argument:

1) A necessary condition of knowledge is intuition (Anschauung).

2) In us, the only mode of intuition is sensible. We have no faculty of intellectual intuition.

3) The concept of God is the concept of an entity that cannot be an object of the senses.

Therefore

4) God is unknowable by us. (1, 2, 3)

Nevertheless

5) God is thinkable by us. (3)

Strong or Extreme Reading.  On this reading,  we cannot talk sense about positive or negative noumena: such categories as substance and causality cannot be meaningfully applied beyond the bounds of sensibility to God, the soul, angels, libertarianly free noumena agents, the world as a whole, or even things in themselves. Riffing on P. F. Strawson one could say that on the strong reading the bounds of sensibility are the bounds of sense.  This reading wins the day in post-Kantian philosophy.  Fichte liquidates the Ding an sich, the neo-Kantians reduce the transcendental ego to a mere concept (Rickert, e.g.), the categories which for Kant were ahistorical and fixed become historicized and relativized, and we end up with a conceptual relativism which fuels a lot of the nonsense of the present day, e.g., race and sex as social constructs, etc.

The strong reading is represented by the following argument:

1*) A necessary condition of meaningful objective reference is intuition.

2) In us, the only mode of intuition is sensible. We have no faculty of intellectual intuition.

3) The concept of God is the concept of an entity that cannot be an object of the senses.

Therefore

4*) God cannot be meaningfully referred to by us.

So my answer to Ed Buckner's title question is:  It depends.  It depends on whether we read Kant in the weak way or in the strong way.  Read in the weak way, Kant is saying that the categories of the understanding  have no cognitive employment in the absence of sensory input, but they do have an empty logical employment and objective reference/meaning.  Read in the strong way, the categories are devoid of objective reference/meaning in the absence of sensory givenness.  If so, the concept of God is a limit concept in the negative sense: it merely marks a limit to our understanding, but does not point beyond that limit. At best, the concept of God is a regulative Idea whose employment is purely immanent.