Tradition
St. Jerome
Against the Pelagians
Book II › Section 9
9. The Apostle shows also his need of grace himself.
1 Corinthians 15:9, 10. By the grace of God I am what I am, etc.
2 Cor. iii. 4-6. Our sufficiency is of God.
Gal. ii. 16. We have believed, that we might, be justified by faith.
ii. 21. If righteousness come by the law, Christ is dead for nought.
iii. 10, 13. Christ has redeemed us from the curse of the law.
Source: Against the Pelagians (New Advent)