Do you think that the arguments for and against every substantive philosophical thesis are equipollent [equal in force], or do you think only that we can never be certain about the truth of the theses? In some of your posts, you suggest that you think the former (e.g. here); but in others, you suggest that you think we can determine some theses as more likely true than others. I'm fairly sure that you hold the former, but I thought I should make sure.
D1. An argument for a thesis T cancels out an argument for the negation of T just in case both arguments are equally plausible, or not far from equally plausible, to the producers(s)/consumers(s) of the arguments, assuming that these individuals are 'competent practitioners.'
Plausibility is relative to an arguer and his audience, if any. With respect to propositions, plausibility is not the same as truth. A plausible proposition needn't be true, and a true proposition needn't be plausible. With respect to arguments, plausibility is neither validity nor soundness as these are standardly defined. Validity and soundness are absolute, like truth herself. Plausibility is relative. There cannot be sound arguments both for a thesis and its negation. For if there is a sound argument for T, then T is true. And if there is a sound argument for ~T, then ~T is true. This is logical fallout from the standard definition of 'sound' according to which a sound argument is one that is deductive, valid, and has only true premises. If there are sound arguments for both a thesis T and its negation ~T, then (T & ~T) is true which violates the Law of Non-Contradiction. Therefore, there cannot be sound arguments for a thesis and its negation.
So I am envisaging situations in which argument and counter-argument are equally plausible or nearly so but only one is sound. Equally plausible to whom? It could be one and the same philosopher. Preston, for example, finds the arguments for and against a regularity theory of causation equally plausible. For him the arguments cancel out and he ends up in a state of doxastic equipoise with respect to the issue. From there he might go on to suspend judgment on the question, or he might investigate further. A third option for one who ends up in doxastic equipoise is to leap to one side or the other. Suppose, after canvassing the arguments for and against the existence of God, or those for and against the immortality of the soul, you find that the cumulative case for and the cumulative case against are equally plausible. You might leap to one side for prudential or pragmatic reasons. You would have no theoretical reason for the leap, but also no theoretical reason against the leap. But the leap might nonetheless be prudentially rational and the refusal to leap prudentially irrational.
Or the plausibility could be to a group of philosophers. Suppose the group has ten members, with five finding the arguments for more plausible than the arguments against, and five taking the opposite stance. I will then say that argument and counter-argument are equally plausible to the group. As I set up the example, none of the members of this group are in a state of doxastic equipoise. But I will make bold to claim that each of them ought to be, assuming that each of them is a competent practitioner. This claim is controversial, and needs defending, but I must move on.
A competent practitioner is not the same as an epistemic peer. A number of individuals may be epistemic peers, but all incompetent. I won't try for a crisp definition of 'competent practitioner,' but if one is a competent practitioner, then he is a sincere truth seeker, not a quibbler or a sophist; he knows logic and the empirical disciplines that bear upon the arguments he is discussing; he is familiar with the relevant literature; he embodies the relevant intellectual virtues, and so on.
The answer to the reader's question will depend on what counts as a substantive or seriously philosophical thesis (SPT). Such theses cannot be denials or affirmations of Moorean facts. Such a fact is roughly a deliverance of common sense. STPs are not at the level of data, but at the level of theory. The distinction between data and theory is not sharply drawn. Border disputes are possible. The theoretical bleeds into the datanic and vice versa. Theories are data-driven, but some data are theory-laden. But I don't believe one can get on without the data-theory distinction.
For example, it is a Moorean fact that some things no longer exist. This cannot be reasonably disputed. Affirm the datum or deny it, you are not (yet) doing philosophy. That Boston's Scollay Square no longer exists is not a philosophical claim, but a proto-philosophical or pre-analytic datum. But if you maintain that what no longer exists does not exist at all, then you go beyond the given to affirm a controversial philosophical thesis known as presentism. Roughly, this is the thesis that, with respect to items in time, only what exists at present exists, period. (It implies that the Wholly No Longer and the Wholly Not Yet are realms of nonexistence.) This is hardly common sense despite what some presentists claim. If Scollay Square is now nothing at all, then how could it be the object of veridical memories and the subject of true predications? A predicate cannot be true of an item unless the item exists.
If, on the other hand, you maintain that what no longer exists does exist, albeit tenselessly, then you are affirming a controversial philosophical thesis known in the trade as eternalism. Eternalism will enable you to explain how a wholly past item can be the object of veridical thoughts and the subject of true predications. But if you try to explain what 'tenseless' means in this context, you will soon entangle yourself in difficulties. Both presentism and eternalism are examples of what I am calling seriously philosophical theses, they cannot both be true, and neither records a Moorean fact.
For a second example, consider the claim that consciousness is an illusion. This is not an SPT, despite its having been urged by philosophers of high repute. It is either beneath refutation or is quickly refuted by a simple argument: illusions presuppose consciousness; ergo, consciousness is not an illusion. There are any number of eliminativist claims that are not SPTs. The claim that there are no claims, for example, 'sounds philosophical' but cannot be taken seriously: it is not an SPT. On the other hand, there are eliminativist claims that are SPTs, for example, the claim that there is no such person as God, or that continuants such as tables and trees do not have temporal parts.
In sum, if you affirm what is obvious or deny what is obvious you are not making a seriously philosophical claim even if what you affirm or deny is highly general and is apt to ignite philosophical controversy when brought into contact with other propositions. For example, if you affirm that some events are earlier than others, you simply a record a datum that no sane person can deny. If, on the other hand, you affirm that everything that people believe is true then you affirm what is datanically false and no object of rational controversy.
I consider all of the following examples of SPTs:
- There are no nonexistent objects.
- There are uninstantiated properties.
- There are no modes of existence.
- The properties of particulars are tropes, not universals.
- God exists.
- The soul is immortal.
- The human will is libertarianly free.
- Each of us is numerically identical to his living body.
- I am not my living body; I merely have a living body.
- Anima forma corporis.
- Die Welt ist meine Vorstellung.
- Laws of nature are just empirical regularities.
- Truths need truth-makers.
- Only facts could serve as truth-makers.
- There are no facts.
- Relations reduce to their monadic foundations.
- There are no properties, only predicates.
- The predicate 'true' serves only as a device for disquotation.
- Social and economic inequalities are justified only if they benefit the worst-off.
There are many more examples, of course. Now what do the above examples have in common? None of them records a Moorean fact. That is, none of them, if true, is obviously true or datanically true. Example. There are two tomatoes on my counter, both ripe, and both (the same shade of) red. That is a given, a datum, not subject to philosophical dispute, certain hyperbolic forms of skepticism aside. But it is not a datum, phenomenological or otherwise, that the redness of the tomatoes is a universal, a repeatable entity, whether a transcendent universal (a one-over-many) or an immanent universal (a one-in-many). For there is an alternative theory according to which the properties of particulars are themselves particulars (unrepeatables). On this theory each tomato has its own redness. Accordingly, there are two rednesses in the example, not one. Both theories explain the data, but they cannot both be true. Phenomenology does not suffice to decide between them; dialectic must be brought in. Once you get the dialectical ball rolling, you will have a hard time stopping it. It will roll down a rabbit hole that opens out into a labyrinth . . . .
Having clarified what I mean by a substantive or serious philosophical thesis, I now state two meta-philosophical theses that I am considering.
The strong thesis is that every SPT is such that the arguments for it and against it cancel out in the sense defined in (D1) above. This implies that no SPT is rationally preferable to its negation. I have my doubts about the strong thesis.
The weak thesis is that a proper subset of SPTs are such that the arguments for and against cancel out. I strongly suspect that the theses that most concern us belong to the proper subset, the hard core of insolubilia.
On the weak thesis, some SPTs will be theoretically-rationally preferable to others.
I want to thank the perspicacious Lukas Novak for helping me in my endless quest to know myself. Professor Novak comments:
4.4 Stump's Quantum Metaphysics
Like Dolezal, Eleonore Stump thinks of God as self-subsistent Being (esse). If God is absolutely simple, and not just simple in the uncontroversial sense of lacking material parts, then God must be self-subsistent Being. God is at once both Being and something that is. He has to be both. If he were Being (esse) but not a being (id quod est), he could not enter into causal relations. He could not do anything such as create the world, intervene in its operations, or interact with human persons. Such a God would be "religiously pernicious." (Stump 2016, 199) Indeed, if God were Being but not a being, then one could not sensibly maintain that God exists. For if Being is other than every being, then Being is not. (It is instructive to note that Martin Heidegger, the famous critic of onto-theology, who holds to the "ontological difference" of Being (Sein) from every being (Seiendes) ends up assimilating Being to Nothing (Nichts).) On the other hand, if God were a being among beings who merely has Being but is not (identically) Being, then he would not be absolutely transcendent, worthy of worship, or ineffable. Such a God would be "comfortingly familiar" but "discomfiting anthropomorphic." (Miller 1996, 3)
The problem, of course, is to explain how God can be both Being and something that is. This is unintelligible to the discursive intellect. Either Being is other than beings or it is not. If Being is other than beings, then Being cannot be. If Being just is beings taken collectively, then God is a being among beings and not the absolute reality. To the discursive intellect the notion of self-subsistent Being is contradictory. One response to the contradiction is simply to deny divine simplicity. That is a reasonable response, no doubt. But might it not also be reasonable to admit that there are things that human reason cannot understand, and that one of these things is the divine nature? "Human reason can see that human reason cannot comprehend the quid est of God." (Stump 2016, 205) As I read Stump, she, like Dolezal, makes a mysterian move, and she, like Dolezal (2011, 210, fn 55), invokes wave-particle duality. We cannot understand how light can be both a wave phenomenon and also particulate in nature, and yet it is both:
Stump, E., 2016, “Simplicity and Aquinas's Quantum Metaphysics” in Gerhard Krieger, ed. Die Metaphysik des Aristoteles im Mittelalter: Rezeption und Transformation, Berlin and Boston: De Gruyter, 191–210.
Dolezal, J. E., 2011, God without Parts: Divine Simplicity and the Metaphysics of God's Absoluteness, Eugene, Oregon: Pickwick Publications.
Miller, B., 1996, A Most Unlikely God, Notre Dame and London: University of Notre Dame Press.
Now for my apologia.
Novak's characterization of me as both a rationalist and a fideist is basically accurate. And yes, the rationalist comes first with exacting requirements. Let me try to illustrate this with DDS. God is the absolute reality, a stupendously rich reality who transcends creatures not only in his properties, but also in his mode of property-possession, mode of existence, mode of necessity, and mode of uniqueness. God is uniquely unique. Such a being cannot be a being among beings. He is uniquely unique in that he alone is self-subsistent Being. Deus est ipsum esse subsistens.
One can reason cogently to this conclusion. Unfortunately, the conclusion is apparently self-contradictory. The verbal formula does not express a proposition that the discursive intellect can 'process' or 'compute.' It is unintelligible to said intellect. For the proposition the formula expresses appears to be self-contradictory. Stump agrees as do the opponents of DDS.
Now there are three ways to proceed.
1) We can conclude, as many distinguished theists do, that the apparent contradictions are real and that God is not absolutely simple, that DDS is a 'mistake.' See Hasker, William, 2016, “Is Divine Simplicity a Mistake?” American Catholic Philosophical Quarterly, 699-725. For Hasker, DDS involves category mistakes, logical failures, and a dehumanization of God. (One mistake Hasker himself makes is to think that a defender of DDS can only tread the via negativa and must end up embracing radical agnosticism about the nature of God. Stump has some interesting things to say in rebuttal of this notion. See Stump 2016, 195-198.)
In short: God is not reasonably believed to be simple.
2) A second way is the mysterian way. The conjunction of God is esse and God is id quod est is an apparent contradiction. But it is not a real contradiction. Characteristic of the mysterian of my stripe is the further claim that the structure of the discursive intellect makes it impossible for us to see that the contradiction is merely apparent.
In short: God is reasonably believed to be simple despite the ineliminable apparent contradictions that this entails because, as Stump puts it, "Human reason can see that human reason cannot comprehend the quid est of God." (Stump 2016, 205) To put the point more generally, it is reasonable to confess the infirmity of human reason with respect to certain questions, and unreasonable to place an uncritical faith in its power and reach. This is especially unreasonable for those who accept the Fall of man and the noetic consequences of sin.
Besides, if God is not a being among beings, then one might expect the discursive intellect to entangle itself in contradictions when it tries to think the Absolute Reality. God, as Being itself, cannot be subsumed under any extant category of beings.
3) A third way is by maintaining that the apparent contradictions can be shown to be merely apparent by the resources of the discursive intellect. In short: God is reasonably believed to be simple, and all considerations to the contrary can be shown to rest on errors and failures to make certain distinction.
What is my argument against (3)? Simply that the attempts to defuse the contradictions fail, and not just by my lights. Almost all philosophers, theists and atheists alike, judge the notion of a simple God to be contradictory.
What is my argument against (1)? Essentially that those who take this line do not appreciate the radical transcendence of God. This point has been argued most forcefully by Barry Miller (1996). Theists who reject divine simplicity end up with an anthropomorphic view of God.
As for Novak's charge of misology or hatred of reason and argument, I plead innocent. One who appreciates the limits of reason, and indeed the infirmity of reason as we find it in ourselves here below, cannot be fairly accused of misology. Otherwise, Kant would be a misologist. I will turn the table on my friend by humbly suggesting that his doxastic security needs sometimes get the better of him causing him to affirm as objectively certain what is not at all objectively certain, but certain only to him. For example he thinks it is epistemically certain that there are substances. I disagree.
But I want to confess to one charge. Lukas writes, "It seems to me that Bill is always too eager to conclude that there is an impasse, an insoluble problem, a contradiction, etc." It may be that I am too zealous in my hunt for aporiai. But I am deeply impressed by the deep, protracted, and indeed interminable disagreement of philosophers through the ages over every substantive question. My working hypothesis for the metaphilosophy book I am trying to finish is that the core problems of philosophy are most of them genuine, some of them humanly important, but all of them insoluble by us. And then I try to figure out what philosophy can and should be if that is the case, whether it should end in mystical silence — that is where Aquinas ended up! — or fuel a Pyrrhonian re-insertion into the quotidian and a living of life adoxastos, or give way to religious faith, or something else.