Chapter 28 [XVIII.]—A Good Will Comes from God.
Men, however, are laboring to find in our own will some good thing of our own,—not given to us by God; but how it is to be found I cannot imagine. The apostle says, when speaking of mens good works, “What hast thou that thou didst not receive? now, if thou didst receive it, why dost thou glory, as if thou hadst not received it?” 570 But, besides this, even reason itself, which may be estimated in such things by such as we are, sharply restrains every one of us in our investigations so as that we may not so defend grace as to seem to take away free will, or, on the other hand, so assert free will as to be judged ungrateful to the grace of God, in our arrogant impiety. 571
1 Cor. iv. 7.56:571
See De Gratiâ Christi, 52; and De Gratiâ et Libero Arbitrio.