Note 5 at Gal. 4:12: Paul is pleading with the Galatians to join him in rejecting the law as a means of being justified with God. Paul was a Jew by natural birth, but he had forsaken the law as a means of being reconciled to God. Therefore, he was living like a Gentile (see note 45 at Mt. 6:32, p. 136) in that sense. He's saying, "be like me (free from the law) because that's the way you really are." The Galatians' tendencies toward legalism hadn't affected Paul. He was going to continue in grace.