The book of Galatians is a letter in the New Testament of the Christian Bible, traditionally attributed to the Apostle Paul. It addresses the early Christian communities in the region of Galatia and focuses on the theme of faith versus works in achieving salvation. Paul emphasizes that salvation comes through faith in Jesus Christ rather than adherence to the Jewish law. In this letter, Paul defends his authority as an apostle and warns against false teachings that promote legalism. He encourages believers to embrace their freedom in Christ and live by the Holy Spirit, highlighting the importance of love and community among followers of Christ.