Book Two — Creation, Chapter 13 — Summa Contra Gentiles
HOW THE AFORESAID RELATIONS ARE PREDICATED OF GOD
[1] It cannot be said, however, that these relations exist as realities outside God.
[2] For, if they did, we should have to consider yet other relations of God to those that are realities, seeing that God is the first of beings and highest of goods. And if these also are realities, we shall be compelled to find third relations; and so on endlessly. The relations by which God is referred to other things, therefore, are not realities existing outside Him.
[3] Moreover, there are two ways in which a thing is predicated denominatively: first, from something external to it; as from place a person is said to be somewhere; from time, some-when; second, from something present in it; as white from whiteness. Yet in no case is a thing denominated from a relation as existing outside it, but only as inhering in it. For example: a man is not denominated father except from the fatherhood which is in him. Therefore, the relations by which God is referred to creatures cannot possibly be realities outside Him.
[4] Having proved that these relations have no real existence in God, and yet are predicated of Him, it follows that they are attributed to Him solely in accordance with our manner of understanding, from the fact that other things are referred to Him. For in understanding one thing to be referred to another, our intellect simultaneously grasps the relation of the latter to it, although sometimes that thing is not really related.
[5] And so it is evident, also, that such relations are not said of God in the same way as other things predicated of Him. For all other things, such as wisdom and will, express His essence; the aforesaid relations by no means do so really, but only as regards our way of understanding. Nevertheless, our understanding is not fallacious. For, from the very fact that our intellect understands that the relations of the divine effects are terminated in God Himself, it predicates certain things of Him relatively; so also do we understand and express the knowable relatively, from the fact that knowledge is referred to it.
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