The central message of this sermon is that true Christianity is a dual measure of faith, comprising both the content (what one believes about Jesus) and the conduct (how one lives in accordance with Jesus' teachings). The preacher argues that these two aspects are intimately intertwined and cannot be separated, as evidenced by various biblical passages that emphasize the importance of both believing the truth about Jesus and living a life of love and obedience to him. In essence, the sermon is highlighting the need for Christians to not only have correct beliefs about Jesus but also to express those beliefs through their actions and conduct. The preacher wants listeners to understand that faith without deeds is dead, and that true Christianity requires both the content (right knowledge of who Jesus is) and the conduct (expressing that knowledge through love and obedience). This dual measure of faith is presented as a key aspect of Christian identity and maturity.