c. 371 · Gregory of Nyssa, On Virginity (De virginitate) 12
Again, a man in building a house for himself may omit to make in it any way of entrance for the light; he will necessarily be in darkness, though he cuts himself off from the light voluntarily. So the first man on the earth, or rather he who generated evil in man, had for choice the Good and the Beautiful lying all around him in the very nature of things; yet he wilfully cut out a new way for himself against this nature, and in the act of turning away from virtue, which was his own free act, he created the usage of evil. For, be it observed, there is no such thing in the world as evil irrespective of a will, and discoverable in a substance apart from that.