Book Two — Creation, Chapter 14 — Summa Contra Gentiles
[6] From these considerations it is clear, also, that it is not prejudicial to God’s simplicity if many relations are predicated of Him, although they do not signify His essence; because those relations are consequent upon our way of understanding. For nothing prevents our intellect from understanding many things, and being referred in many ways to that which is in itself simple, so as to consider that simple reality under a manifold relationship. And the more simple a thing, the greater is its power, and of so many more things is it the principle, so that it is understood as related in so many more ways. Thus, a point is the principle of more things than a line is, and a line than a surface. Therefore, the very fact that many things are predicated of God in a relative manner bears witness to His supreme simplicity.
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