"For I through the law died to the law that I might live to God. I have been crucified with Christ; it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me. I do not set aside the grace of God; for if righteousness comes through the law, then Christ died in vain." Gal 2:19-21
These are words
that Paul spoke to Peter, who was being a hypocrite. What was Peter's
hypocrisy? Was he caught in some big sin? Was it that he had broken some
laws? No! Peter's hypocrisy was that he was living like a Gentile
(living without regard to God's laws - which Paul was perfectly fine with)... but yet he
was compelling Gentiles (those who never had the law in the first place) to live like Jews (making them keep God's laws)!
So Paul "withstood him to his face," because the very gospel message
that Paul was proclaiming was that "I died to the law that I might live
to God." "If all of this was about keeping God's laws," says Paul (in
my own words), "then Christ died for nothing! We don't live by God's
laws, we live by faith in the Son of God who loved us and gave Himself
for us, and in fact lives in us!"