To Florus 2.228

But this gave occasion for the same question he had explained above: someone might object that people freed from the law, which threatened wrath, could safely sin under the kindness of God’s grace. He therefore immediately added: ‘What then? Shall we sin because we are not under law but under grace? Far from it! Or do you not know that when you present yourselves as slaves for obedience, you are slaves of the one you obey, whether of sin or of obedience to righteousness?’ (Romans 6:15–16). Do we now believe him about the kind of sin he has been discussing? When you present yourselves, he says, as slaves for obedience, you are slaves of that one, whether of sin or righteousness. Where, then, does the apostle indicate here that sin which is imagined to have flown over the very seed before the time of willing, before the activity of obedience, before the age of knowledge and conscience? Such a thing certainly can be found only in Manichaean books.