Joe, who describes himself as "a high school student with a passion for philosophy of religion and metaphysics," asked me a long series of difficult questions. Here is one of them:
After reading [Edward] Feser's Five Proofs, I have had difficulties with the concept of sustaining causes. First, Feser argues that composites require a sustaining cause in order to "hold them together" or keep them conjoined. But this seems to presuppose that all composite things (be it physical composites or metaphysical composites) are contingent.
But why suppose that, necessarily, all composites are contingent? What is incoherent about this:
X is a necessary being (i.e. X cannot fail to exist). X has metaphysical parts A, B, and C. Each of A, B, and C are also necessarily instantiated in reality, and the relations between A, B, and C are all necessarily instantiated in reality.
Why ought we to rule out this epistemic possibility? This seems to be a necessary being which is composite. It would be a counter-example to the assumption that composition entails contingency (where contingency means can fail to exist).
If we take composition broadly enough, composition does not entail contingency. Consider the set, {1, 3, 5}. Assume that numbers are necessary beings. Then of course the set will also be a necessary being. Furthermore, the relations that hold between the members of this set hold necessarily. For example, necessarily, 3 < 5, and necessarily, 3 > 1. So if we think of sets as composite entities, then it is not the case that all composites are contingent.
But what Feser is concerned with are material particulars, or material substances, to use the Aristotelian-scholastic jargon, e..g., a horse, a statue, a man. And of course these cannot be taken to be sets of their metaphysical parts. If I understand Feser, what he is asking is: what makes a contingent being such as Socrates contingent? The question is not whether he is contingent, but what makes him contingent. What is the ground of his contingency? The answer is that Socrates is contingent because he is composite. Composition or rather compositeness is the ground of contingency. His contingency is explained by his compositeness, in particular, his being a composite of essence and existence. So at the root of contingency is the real distinction (distinctio realis) of essence and existence in finite substances.
The claim is not that every composite entity is contingent, but that every contingent substance is contingent in virtue of its being composite.
Now if a contingent substance is contingent in virtue of its being composed of essence and existence, then a necessary being, or rather, a necessary being that has its necessity from itself and not from another, is necessary in virtue of its being simple, i.e., absolutely non-partite. This is how Thomists feel driven to the admittedly strange and seemingly incoherent doctrine of divine simplicity.
If there is to be an ultimate explanation of the existence of contingent beings, this explanation must invoke an entity that is not itself contingent. The ultimate entity must exist of metaphysical necessity and have its necessity from itself. Thomism as I understand it plausibly maintains that the ground of the divine necessity is the divine simplicity. God is necessary because in God essence and existence are one and the same.
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