Augustine Quote (Free Will and Mortification of Sin)

"If he should say in respect of these commandments, 'I wish to keep them, but am mastered by my concupiscence,' then the scripture responds to his free will, as I have already said: 'Be not overcome of evil, but overcome evil with good' (Romans 12:21). In order that, however, that this may be gained, grace renders its help; and were not this help given, then the law would be nothing but strength of sin Augustine On Grace and Free Will Ch.VIII).