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

Is the law then contrary to the promises of God? God forbid. For if there had been a law given which was capable of procuring life, verily righteousness would have been by the law.

Behold, I Paul declare to you, that if ye be circumcised, Christ will be of no advantage to you.

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

But if by grace, it is no more by works: otherwise grace is no more grace. But if by works, it is no more grace: otherwise work is no more work.

If therefore there was perfection by the Levitical priesthood (for under that the people had the law given to them), what farther need was there that another priest should arise after the order of Melchisedec, and not be called after the order of Aaron?

Christ

by which also ye are saved; if ye cleave to that word I have preached to you, except haply ye have believed in vain.

General references

For if I build up again the very same things which I have pulled down, I stamp myself a transgressor.