That the Human Soul is brought into Being by a Creative Act of God

Everything that is brought into being is either generated or created. But the human soul is not generated, either by way of composition of parts or by the generation of the body (Chap. LXXXVI); and yet it comes new into existence, being neither eternal nor pre-existent (Chapp. LXXXIII, LXXXIV): therefore it comes into being by creation. Now, as has been shown above, God alone can create (Chap. XXI).

2. Whatever has existence as subsistent being, is also made in the way that a subsistent being is made: while whatever has no existence as a subsistent being, but is attached to something else, is not made separately, but only under condition of that having been made to which it is attached. But the soul has this peculiarity to distinguish it from other forms, that it is a subsistent being; and the existence which is proper to it communicates to the body. The soul then is made as a subsistent being is made: it is the subject of a making-process all its own, unlike other forms, which are made incidentally in the making of the compounds to which hey belong. But as the soul has no material part, it cannot be made out of any subject-matter: consequently it must be made out of nothing, and so created.

5. The end of a thing answers to its beginning. Now the end of the human soul and its final perfection is, by knowledge and love to transcend the whole order of created things, and attain to its first principle and beginning, which is God. Therefore from God it has properly its first origin.

Holy Scripture seems to insinuate this conclusion: for whereas, speaking of the origin of other animals, it scribes their souls to other causes, as when it says: Let the waters produce the creeping thing of living soul (Gen. i, 20): coming to man, it shows that his soul is created by God, saying: God formed man from the slime of the earth, and breathed into his face the breath of life (Gen. ii, 7).

2.86 : That the Human Soul is not transmitted by Generation
2.88, 89 : Arguments against the Truth of the Conclusion last drawn, with their Solution