How do we know that Jesus Christ is the center of all doctrine?

Paul emphasizes the necessity of teaching no other doctrine than that which centers on Jesus Christ and Him crucified. This foundational truth is pivotal to the Christian faith, as it is Christ alone who sustains and fulfills the law and the prophets. Any deviation into other doctrines or teachings that do not focus on this core truth leads believers away from the essence of the gospel. Therefore, all teachings should align with the message of Christ's redemptive work, reminding us that our hope rests solely in Him.