Galatians 2  Paul continues to teach about the "truth of the gospel".. giving two instances which support his message.  

First, after 14 years, he went up to Jerusalem to speak to the Apostles Peter, James, and John.. to submit to them the gospel message that he preached to the Gentiles.  He was assured by these "reputed pillars of the church".. that he was indeed preaching the true gospel and he was once again commissioned to go and minister to the Gentiles. 

But later, when Peter came to Antioch, there was a bit of a confrontation.  Peter, at first ate with the Gentiles, but when the other Jewish leaders came, he withdrew.. "fearing the party of the circumcision".  This was hypocritical in Paul's opinion, and he spoke up about it with a strong protest.  This was giving the wrong message to the Gentile believers.  Paul explains again that the "truth of the gospel"  is that men can only be justified by faith in Jesus Christ.. not in any works of the Law.. not in any way of the flesh.  

The true gospel is displayed in Paul's testimony beginning in verse 20 "I have been crucified with Christ and 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 delivered Himself up for me."  All of grace.. none of flesh. 

We cannot work or observe rituals.. we cannot save ourselves in any way shape or form.  It is in the supernatural, powerful,  amazing work of Christ our Savior, who died on the cross.. who rose again.. and who ascended to the right hand of the Father.. that we receive salvation! It is by faith.  Because of  His grace, we are saved from our sins.. from death.. and from hell. 

Father in heaven, we are Yours, through Jesus Christ, the Lamb of God, who died for us. We give ourselves fully into Your hands and live by faith in Him alone.  Oh what wondrous grace You have given us! Praise and honor and thanksgiving to Your Holy Name! Amen