1 Two young men, Cresconius and Felix, have found their way to us, and, introducing themselves as belonging to your brotherhood, have told us that your monastery was disturbed with no small commotion, because certain among you preach grace in such a manner as to deny that the will of man is free; and maintain--a more serious matter--that in the day of judgment God will not render to every man according to his works. At the same time, they have pointed out to us, that many of you do not entertain this opinion, but allow that free will is assisted by the grace of God, so as that we may think and do aright; so that, when the Lord shall come to render unto every man according to his works, He shall find those works of ours good which God has prepared in order that we may walk in them. They who think this think rightly.
2. "I beseech you therefore, brethren," even as the apostle besought the Corinthians, "by the name of our Lord Jesus Christ, that you all speak the same thing, and that there be no divisions among you." For, in the first place, the Lord Jesus, as it is written in the Gospel of the Apostle John, "came not to condemn the world, but that the world by Himself might be saved." Then, afterwards, as the Apostle Paul writes, "God shall judge the world when He shall come," as the whole Church confesses in the Creed, "to judge the quick and the dead." Now, I would ask, if there is no grace of God, how does He save the world? And if there is no free will, how does He judge the world? That book of mine, therefore, or epistle, which the above-mentioned brethren have brought with them to you, I wish you to understand in accordance with this faith, so that you may neither deny God's grace, nor uphold free will in such wise as to separate the latter from the grace of God, as if without this we could by any means either think or do anything according to God,--which is quite beyond our power. On this account, indeed, it is, that the Lord when speaking of the fruits of righteousness said, "Without me you can do nothing."
Source: Letters (New Advent)