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A second example:
3. God by his very nature as divine is a concrete being who exists of metaphysical necessity.
4. Nothing concrete could exist of metaphysical necessity.
By ‘concrete’ I mean causally active/passive. The God in question is not a causally inert abstract object like a number or a set-theoretical set. Clearly, (3) and (4) form a contradictory pair and so cannot both be true. And yet one can argue plausibly for each.
This is not the place for detailed arguments, but in support of (3) there are the standard Anselmian considerations. God is ens perfectissimum; nothing perfect could be modally contingent; ergo, etc. God is “that than which no greater can be conceived”; if God were a merely contingent being, then a greater could be conceived; ergo, etc.
In support of (4), there is the difficulty of understanding how any concrete individual could exist necessarily. For such a being, possibility suffices for actuality: if God is possible, then he is actual. But this possibility is not mere possibility; it is the possibility of an actual being. (God is at no time or in any possible world merely possible, if he is possible at all.) The divine possibility — if it is a possibility at all and not an impossibility — is a possibility that is fully actualized. Possibility and actuality in God are one and the same in reality even though they remain notionally distinct for us. (In classical jargon, God is pure act, actus purus.) Equivalently, essence and existence in God are one and the same in reality even if they must remain notionally distinct for our discursive/dianoetic intellects. It is God’s nature to exist. God is an existing essence in virtue of his very essence. God’s existence is in no way subsequent to his essence, not temporally, of course, but also not logically or ontologically. So it is not quite right to say, as many do, that God’s nature entails his existence; God’s nature is his existence, and his existence is his nature.
If you think this through very carefully, you will realize that the ground of the divine necessity is the divine simplicity. It is because God is an ontologically simple being that he is a necessary being. If you deny that God is simple but affirm that he is necessary, then I will challenge you to state what makes him necessary as opposed to impossible. If you say that God is necessary in virtue of existing in all possible worlds, then I will point out that that gets us nowhere: it is simply an extensional way of saying that God is necessary. You have also faied to distinguish God from such ‘garden variety’ necessary beings as numbers and sets.
Divine simplicity implies no real distinctions in God, and thus no real distinction between essence and existence. It is the identity of essence and existence in God that is the root, source, ground of the divine necessity. The problem is that we, with our discursive intellects, cannot understand how this could be. Anything we conceive as existent, we can also conceive as nonexistent. (Hume) The discursive intellect cannot grasp the possibility of a simple being, and so it cannot grasp the possibility of a necessary concretum. Here then we have the makings of an argument that, in reality, every concretum is contingent, which is equivalent to the negation of (4).
So if one philosopher urges (3) and his interlocutor (4), and neither can convince the other, then the two are in a standoff.
Now you may quibble with my examples, but there are fifty more I could give (and you hope I won’t).
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