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. Third Argument. This argument is likewise based on one of the Propositions of the Kalâm. For some of the Mutakallemim belonging to the old school assume, that when the Creator wills a thing, the will is not an element superadded to the essence of God: it is a will without a substratum. In accordance with the propositions which we have mentioned, and of which, as you will see, it is difficult to form a true conception, they say that one will, which is independent of any substratum, cannot be ascribed to two beings; for, as they assert, one cause cannot be the source of two laws for two essences. This is, as I told you, the method of explaining one difficulty by means of another and still greater difficulty. For as they define the Will, it is inconceivable, and some have, therefore, considered it to be a mere non-entity; others who admit its existence, meet with many insuperable difficulties. The Mutakallemim, nevertheless, establish on its existence one of the proofs for the unity of God. Fourth Argument.