For now do
The demonstration is as follows:
(1) The Galatians know Paul, that he is no seeker after popularity. (Galatians 1:10).
(2) He puts his known character back of the assertion that his Gospel of grace was a revelation from God. (Galatians 1:11); (Galatians 1:12).
(3) As for the Judaizers, Paul had been a foremost Jew, and had forsaken Judaism for something better. (Galatians 1:13-14).
(4) He had preached grace years before he saw any of the other apostles. (Galatians 1:15-24).
(5) When he did meet the other apostles they had nothing to add to his revelations. (Galatians 2:1-6).
(6) The other apostles fully recognized Paul's apostleship. (Galatians 2:7-10).
(7) If the legalizers pleaded Peter's authority, the answer was that he himself had claimed none when rebuked. (Galatians 2:11-14).