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evident that words relate to the meaning of things signified through the medium of the intellectual conception. It follows therefore that we can give a name to anything in as far as we can understand it. Now it was shown above (Q. 12, AA. 11, 12) that in this life we cannot see the essence of God; but we know God from creatures as their principle, and also by way of excellence and remotion. In this way therefore He can be named by us from creatures, yet not so that the name which signifies Him expresses the divine essence in itself. Thus the name "man" expresses the essence of man in himself, since it signifies the definition of man by manifesting his essence; for the idea expressed by the name is the definition.
Reply Obj. 1: The reason why God has no name, or is said to be above being named, is because His essence is above all that we understand about God, and signify in word.
Reply Obj. 2: Because we know and name God from creatures, the names we attribute to God signify what belongs to material creatures, of which the knowledge is natural to us. And because in creatures of this kind what is perfect and subsistent is compound; whereas their form is not a complete subsisting thing, but rather is that whereby a thing is; hence it follows that all names used by us to signify a complete subsisting thing must have a concrete meaning as applicable to compound things; whereas names given to signify simple forms, signify a thing not as subsisting, but as that whereby a thing is; as, for instance, whiteness signifies that whereby a thing is white. And as God is simple, and subsisting, we attribute to Him abstract names to signify His simplicity, and concrete names to signify His substance and perfection, although both these kinds of names fail to express His mode of being, forasmuch as our intellect does not know Him in this life as He is.