How do we know the Gospel is true according to Paul?

In Galatians 1:11-12, Paul emphasizes the divine origin of the Gospel he preached, making it clear that it was revealed to him directly by Christ Himself. This assertion downplays the influence of human teachers and spiritual authorities on his understanding of the Gospel. Instead, Paul points to a personal, transformative encounter with Jesus as foundational to his faith and mission. This claim underlines the sovereign grace of God in revealing Himself, affirming that true belief in the Gospel stems from divine revelation rather than mere human persuasion.