How do we know that the gospel Paul preached is true?

Paul makes it clear that his message to the Gentiles was not learned from man but was revealed directly by Jesus Christ. This divine origin is crucial to its authenticity and reliability. He emphasizes that the gospel he preaches is congruent with the Old Testament Scriptures, affirming the unity of God's redemptive plan. When he goes to Jerusalem to communicate with the other apostles, he does so not to gain their approval but to ensure that his gospel aligns with the true message of Christ, demonstrating that true authenticity is rooted in divine revelation rather than human tradition or influence.