Now if we could obtain remission of sin by works, which are not embraced in the Jewish ceremonies, and thus merit righteousness, what need would there be of Christ and his promises? Everything that Paul said in various places concerning the promises, would be overthrown at once. He would be in error, when writing to the Ephesians 2:8–9, “For by grace are ye saved, through faith; and that not of yourselves: it is the gift of God; not of works.”
Again, in the Epistle to the Romans, chap. 4:1–6, Paul alleged of Abraham and David:—They had received a commandment from God concerning circumcision. Now if any works justify before God, then the works, which God had commanded at that time, must also have justified.
But Augustine clearly maintains, that Paul is speaking of the whole law; and he argues at length, in his work concerning the spirit and the letter, (de Spiritu et Litera,) when he finally says, “Having now weighed and treated this subject, according to the strength which God has given us, we arrive at the conclusion, that no man is justified by the precepts enjoining a good life, but by faith in Jesus Christ.” (Henkel Translation, p. 174-175).