To Florus 3.195

Consequently you have come back to restoring by argument the Manichaean whom you despised in your profession. Saying, ‘If it were evil, it ought not to be saved,’ you assumed the appearance of fighting him. Adding, ‘But if no evil were within it, it would not need to be saved’ (Augustine, Marriage and Sexual Desire 2.36), you showed that you serve him faithfully. It has therefore become clear that your pronouncement contains the same as Mani’s: human nature is evil, since both you and he say evil exists within it. And you have declared that an evil nature ought not to be saved. It has thus been established completely that your faith, with its forces wholly united to his, attacks both nature and grace.