In his letter to the Galatians, Paul defends his position as apostle and goes further to state that he was pre-ordained by God to serve others through sharing the good news with the world. In Galatians 1:13, he reminds the Galatians that he too came from a Jewish background, "For you have heard of my previous way of life in Judaism, how intensely I persecuted the church of God and tried to destroy it. I was advancing in Judaism beyond many jews of my age and was extremely zealous for the traditions of my fathers." He shares this with the Galatians because, though they are ardent believers in Jesus Christ, they are also trying to impose the Jewish law (circumcision, for example) on the Gentile Christians. Paul reminds them that they are saved by grace alone, not by the works of their law. In Galatians, he encourages them to love one another; 6:10, "Therefore, as we have opportunity, let us do good to all people, especially to those who belong to the family of believers."
Today, we can remember that though other Christians may come from different backgrounds and observe different customs, it is God's grace alone that saves us. Knowing this enables us to see all Christians as brothers and sisters in the body of Christ, working to serve Him!