Chapter 13 — That God is not a genus

Furthermore, it is to be shown that God cannot be a genus, either. What a thing is comes from its genus, but not that it is; for the thing is established in its proper existence through specific differences. But that which God is, is very existence itself. Therefore, he cannot be a genus.

Moreover, every genus is divided by some differences. But no specific differences can be found for being itself. For differences do not share in genus except indirectly, insofar as the species that are constituted by differences share in a genus. But there cannot be any difference that does not share in being, since non-being is not a specific difference of anything. Accordingly, God cannot be a genus predicated of several species.