20: What are the 8 attributes of God?

St Thomas Aquinas, in the first part of his Summa Theologica, after having enumerated five proofs for the existence of God, proceeds to outline and explicate his attributes, of which Thomas says He has eight:

1) Simplicity, 2) perfection, 3) goodness, 4) infinity, 5) ubiquity, 6) immutability, 7) eternity, and 8) unity.

This is the order in which he deals with them and I thought I would provide a quick summary of each in the same order for those that are interested.

To read what Thomas himself says, start here in the Summa.

1. THE SIMPLICITY OF GOD. The Simplicity of God means that God has no parts, that He is not composed in any way. He is not, as we are, the composition of body and soul, nor is He the composition of essence and existence. One of Thomas' arguments for why God is not a composition of body and soul is the following: 1. Bodies, by necessity, move. 2. God is the unmoved mover. 3. Therefore God does not have a body (this may be the quickest refutation of Mormonism ever!). Nor is God a composition of essence (what a thing is) and existence (that a thing is). Rather, in God, essence and existence are the same thing. We see Biblical evidence of this in the book of Exodus where God responds to Moses' request for a name, "I am who I am" (3:14). If essence and existence were not the same in God, if what he was was not the same thing as that he was, then there would exist outside of God the reason for his existence, which is absurd.

2. THE PERFECTION OF GOD

The perfection of God means that God lacks nothing. He is the the fullness of being. As St. Thomas says, "to be the first principle for others it is necessary to be maximally in act, and as such the most perfect being." The more a being is like God, the more perfect it is. The fact that we can even say that one being is more perfect than another implies a most perfect being, and this, of course, is the crux of Thomas' fourth proof for the existence of God.

3. THE GOODNESS OF GOD God, who is the greatest conceivable being, is also goodness itself, since being and goodness are really convertible. A being, in so far as it is like God, is good, and a being, in so far as it is unlike God, is not. Given that all creation is ordered to this good, one might reasonably ask, "If all creation is ordered toward the supreme good, who is God, to what good may we say that God is ordered? To none other than the supreme good who is himself. The only appropriate finality for an infinite being is infinite being."

4. THE INFINITY OF GOD The infinity of God refers to the fact that God is in no way limited. He is Subsistent being itself. "God is," in the words of D.Q. McInerny, "without limits because He is Himself the inexhaustible source of all the riches of being.