A reader asks:
You seem to hold that, if God is identical to his existence, then God is Existence itself. Why think that? Why not think instead that, if God is identical to his existence, then he is identical to his 'parcel' of existence, as it were?
This is an entirely reasonable question. I will try to answer it.
First of all, when we say that God is identical to his existence, we mean that there is no real distinction in God between essence (nature) and existence in the way in which there is a real distinction in Socrates (our representative creature) between essence (nature) and existence. It is the real distinction in Socrates that grounds his metaphysical contingency, while it is the lack of such a distinction in God that grounds his metaphysical necessity.
This is to say that God, unlike creatures, is ontologically simple. In a slogan of St Augustine, God is what he has. Thus he has his existence by being his existence. Why must God be simple? Because he is the absolute reality. If your god is not the absolute reality, then your god is not God but an idol. The absolute cannot depend on anything else for its nature or existence on pain of ceasing to be the absolute. It must possess aseity, from-itself-ness.
Now Existence is in some way common to everything that exists, though it is not common in the manner of a property or a concept. Thus God and Socrates have Existence in common. If God is not identical to Existence, then he is like Socrates and must depend on Existence as something other than himself to exist. But this violates the divine aseity.
Therefore, God is not only identical to his existence, he is identical to Existence itself.
Objection: "If God is identical to Existence, then God alone exists, which flies in the face of the evident fact that there is a plurality of non-divine existents."
Reply: The objection succeeds only if there are no different ways of existing. But if God exists-underivatively and creatures exist-derivatively, then God's identity with Existence does not entail that God alone exists; it entails that God alone exists-underivatively.
The picture is this. Existence is that which makes derivative existents exist. If Existence did not itself exist, then nothing would exist. So Existence itself exists. It is identical to God. God is the unsourced Source of everything distinct from God. God, as Existence itself, is the Paradigm Existent. God is at once both Existence and the prime case of Existence.
In this respect, God is like a Platonic Form in which all else participates. (It is worth recalling in this connection that Aquinas speaks of God as forma formarum, the form of all forms.) God is self-existent Existence; creatures are not self-existent, but derive their existence from self-existent Existence.
Objection: "This scheme issues in something like the dreaded Third Man Regress. If Socrates and Plato both exist by participating in Existence, which exists, then there are three things that exist, Socrates, Plato, and Existence, each of which exists by participation. If so, there must be a second Existence, Existence-2 that Socrates, Plato and Existence-1 participate in. But then an infinite regress is up and running, one that is, moreover, vicious."
Response: The Third Man Regress is easily blocked by distinguishing the way Existence exists and the way derivative existents exist. Socrates exists by participating in Existence; Existence exists, not by participation, but by being (identical to) Existence.
There is exactly one case in which existence = self-identity. This is the case of the Paradigm Existent, which is Existence itself, which is God. In every other case, existence is not self-identity. No doubt Socrates is self-identical; but his self-identity is not the ground of his existence.
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