and not sinners of the Gentiles, Even we (knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ) have believed in Christ Jesus, that we might be justified by the faith of Christ, and not by the works of the law; because by the works of the law no flesh shall be justified.

Is then the law against the promises of God? God forbid. But if there had been a law given which could have given life, verily righteousness would have been by the law.

Behold, I Paul say unto you, If ye be circumcised, Christ shall profit you nothing.

For they being ignorant of the righteousness of God, and seeking to establish their own righteousness, have not submitted to the righteousness of God.

But if by grace, then it is no more of works: else grace is no longer grace. And if it be of works, then it is no more grace; else work is no longer work.

If then perfection were by the Levitical priesthood, (for under it the people received the law) what farther need was there that another priest should rise, after the order of Melchisedek, and not be called after the order of Aaron?

Christ

By which also ye are saved, if ye retain what I preached to you, unless ye have believed in vain.

General references

God forbid. For if I build again the things which I destroyed, I make myself a transgressor.