We go on to show that God cannot be a genus. What a thing is, but not that it is, comes from its genus; the thing is established in its proper existence by 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 differences can be apprehended in very existence itself. For differences do not share in genus except indirectly, so far as the species that are constituted by differences share in a genus. But there cannot be any difference that does not share in existence, since non-being is not the specific difference of anything. Accordingly God cannot be a genus predicated of a number of species.
St. Thomas Aquinas. (1265-1274). Compendium Theologiae: God Not a Genus, trans. by Cyril Vollert. St. Louis & London: B. Herder Book Co., 1947
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