How do we know that the teachings of Paul in Galatians are true?

The credibility of Paul's teachings in Galatians stems from his assertion of divine apostolic authority. In Galatians 1:1, Paul declares that he is an apostle 'not of men, neither by man, but by Jesus Christ and God the Father.' This emphasizes that his message is divinely ordained, directly derived from Christ, who holds authority over both law and grace. Throughout the letter, Paul outlines the fundamental doctrines of the faith, including justification by faith and the significance of Christ's atoning sacrifice. As he further engages with the false teachings presented by the Judaizers, he reiterates that salvation is found only in Christ, who fulfills the law and removes the burden of legalistic observance. This reliance on divine authority validates the teachings as true and essential for the church.