The Refutation of All Heresies, Book 1

And he admits natures (such as those) of demons, and says that some of them are good, but others worthless. And some affirm that he states the soul to be uncreated and immortal, when he uses the following words, Every soul is immortal, for that which is always moved is immortal; and when he demonstrates that the soul is self-moved, and capable of originating motion. Others, however, (say that Plato asserted that the soul was) created, but rendered imperishable through the will of God.