Chapter LXXV, Second Argument.

If there were two Gods, there would necessarily be some element common to both, whilst some element present in the one would be absent in the other, and constitute the specific difference between them. This is a philosophic and sound argument for those who are able to examine it, and to obtain a clear insight into its premises, which will be further explained, in our exposition of the view of the philosophers on this point. But it cannot be accepted by those who admit the existence of divine attributes. For according to their opinion, the Primal Cause includes many different elements. They represent its wisdom and its omnipotence as two different things, and again the omnipotence as different from the will. Consequently it would not be impossible that either of the two divine beings possessed several properties, some of which would be common to both, and some peculiar to only one of them.