Galatians 2:18-21

Rather, I am a sinner if I rebuild the old system of law I already tore down. For when I tried to keep the law, it condemned me. So I died to the law—I stopped trying to meet all its requirements—so that I might live for God. My old self has been crucified with Christ. It is no longer I who live, but Christ lives in me. So I live in this earthly body by trusting in the Son of God, who loved me and gave himself for me. I do not treat the grace of God as meaningless. For if keeping the law could make us right with God, then there was no need for Christ to die.