When you are united to Christ, Christ lives in you and produces the holiness called for by the Law.
In the Book of Galatians, Paul's life unavoidably intersects with the doctrine he espouses.
Before moving on to address correct doctrine, the Apostle Paul's own apostolic ministry is detailed as an essential part of his defense of the Gospel.
As Paul defends the Gospel that he preaches to the Galatian church he does not defend his own reputation nor give his personal testimony.
The Apostle Paul sternly warns the church about the dangers of apostasy as well as the divine condemnation that awaits those who would teach and lead others away from the faith.