c. 370–419 · Jerome, Letters 133.5
The better to deceive men they have added to the maxim given above the saving clause “but not without the grace of God;” and this may at the first blush take in some readers. However, when it is carefully sifted and considered, it can deceive nobody. For while they acknowledge the grace of God, they tell us that our acts do not depend upon His help. Rather, they understand by the grace of God free will and the commandments of the Law. They quote Isaiah’s words: “God hath given the law to aid men,” and say that we ought to thank Him for having created us such that of our own free will we can choose the good and avoid the evil. Nor do they see that in alleging this the devil uses their lips to hiss out an intolerable blasphemy. For if God’s grace is limited to this that He has formed us with wills of our own, and if we are to rest content with free will, not seeking the divine aid lest this should be impaired, we should cease to pray; for we cannot entreat God’s mercy to give us daily what is already in our hands having been given to us once for all. Those who think thus make prayer impossible and boast that free will makes them not merely controllers of themselves but as powerful as God.