The book of Galatians, which is a letter written by the Apostle Paul. Throughout the letter, Paul addresses the churches in Galatia, expressing his astonishment that they are turning away from the true Gospel he preached. He asserts his apostolic authority, explaining how he received his message directly from Jesus Christ and not from human teachings. A central theme is justification by faith in Christ rather than adherence to Old Testament law, particularly circumcision, arguing that Christ's sacrifice redeems believers from the law's curse. Paul emphasizes that believers are sons of God through faith and should live by the Spirit, which leads t ...