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God and the mind exist, and in no way differ, for they could only be differentiated by certain differences, and thus would be composite. Therefore God and the human mind are the same.
_On the contrary,_ Augustine (De Orig. Animae iii, 15) mentions certain opinions which he calls "exceedingly and evidently perverse, and contrary to the Catholic Faith," among which the first is the opinion that "God made the soul not out of nothing, but from Himself."
_I answer that,_ To say that the soul is of the Divine substance involves a manifest improbability. For, as is clear from what has been said (Q. 77, A. 2; Q. 79, A. 2; Q. 84, A. 6), the human soul is sometimes in a state of potentiality to the act of intelligence --acquires its knowledge somehow from things--and thus has various powers; all of which are incompatible with the Divine Nature, Which is a pure act--receives nothing from any other--and admits of no variety in itself, as we have proved (Q. 3, AA. 1, 7; Q. 9, A. 1).
This error seems to have originated from two statements of the ancients. For those who first began to observe the nature of things, being unable to rise above their imagination, supposed that nothing but bodies existed. Therefore they said that God was a body, which they considered to be the principle of other bodies. And since they held that the soul was of the same nature as that body which they regarded as the first principle, as is stated _De Anima_ i, 2, it followed that the soul was of the nature of God Himself. According to this supposition, also, the Manichaeans, thinking that God was corporeal light, held that the soul was part of that light bound up with the body.
Then a further step in advance was made, and some surmised the existence of something incorporeal, not apart from the body, but the form of a body; so that Varro said, "God is a soul governing the world by movement and