The book of Galatians has two major themes, and we see these themes in the introduction to the letter. First, we learn about the authority of the messenger. Paul had authority as an apostle, and his inspired writings are our authority today. If we disobey and disbelieve the Scripture, then we disobey and disbelieve God. Second, we learn about the good news of the message. We experience God’s grace and we become His sons and daughters because Jesus “gave himself for our sins to deliver us from the present evil age.”