Gal 2:15-17  "We ourselves are Jews by birth and not Gentile sinners; yet we know that a person is not justified by works of the law but through faith in Jesus Christ, so we also have believed in Christ Jesus, in order to be justified by faith in Christ and not by works of the law, because by works of the law no one will be justified. But if, in our endeavor to be justified in Christ, we too were found to be sinners, is Christ then a servant of sin? Certainly not!" 


You know that I ,Paul, am a Jew by birth, born into the observance of the law, not into a home that didn't know or attempt to follow God's law. Even as a Jew I know that I was not justified before God by the law, but only forgiveness and justification come through faith in Jesus Christ, Isa Al Masih, Yeshua Messiah. He is Yahweh come in the flesh. He is Absolute Love incarnate. No one can be justified by keeping the Law because we all fail. The royal law of love isn't kept by doing better at keeping the law than the next person.
For if I rebuild outwardly the ceremony and ritual of law while hating, killing and murdering others, I prove that I am a law breaker. For through my zealous following of the law I died to law keeping. It is only through being crucified and dying to myself, following after Christ that I now am alive to God and His love. Jesus Christ lives in me and the life I now live in obedient love and law keeping I live through Christ and by the faith I have in His love and sacrifice of Himself for me.


Gal 2:18-20  "For if I rebuild what I tore down, I prove myself to be a transgressor. For through the law I died to the law, so that I might live to God. I have been crucified with Christ. It is no longer I who live, but Christ who lives in me. And the life I now live in the flesh I live by faith in the Son of God, who loved me and gave himself for me." 


So I do not nullify grace nor do I forsake living righteously, for the law pointed to Christ Jesus and His death now establishes the righteousness of God in forgiving us. 
Jesus was crucified right in front of you and many of you saw Him rise again, but you received the Holy Spirit who established you in Christ by faith. You didn't receive the Holy Spirit of God by doing good but as a gift of God's grace. 
It would be foolish to now think you can proceed in keeping God's law by your own effort as a work. You must see that God works this kind of miracle in you and others by hearing the good news and coming to believe and have faith in God's love. It is just like Abraham the father of faith. He believed and the reult of faithful obedience He was counted as righteous before God.  


Gal 2:21-3:6  "I do not nullify the grace of God, for if righteousness were through the law, then Christ died for no purpose.  O foolish Galatians! Who has bewitched you? It was before your eyes that Jesus Christ was publicly portrayed as crucified.  Let me ask you only this: Did you receive the Spirit by works of the law or by hearing with faith? Are you so foolish? Having begun by the Spirit, are you now being perfected by the flesh? Did you suffer so many things in vain--if indeed it was in vain?  Does he who supplies the Spirit to you and works miracles among you do so by works of the law, or by hearing with faith--  just as Abraham "believed God, and it was counted to him as righteousness"? 


So remember this one thing, one thing you should always know, is that faith shows who are sons of Abraham and God's children. The Word of God proclaimed this in the blessing given to Abraham, all natons would be blessed in you, as they come to believe and have faith in my goodness and love. I am Absolute Love and all those who have faith in me are blessed in my steadfast love. 


Gal 3:7-9  "Know then that it is those of faith who are the sons of Abraham. And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, "In you shall all the nations be blessed." So then, those who are of faith are blessed along with Abraham, the man of faith."