The central message of this sermon is that Jesus' authority is not based on human tradition, ritual, or formula, but rather on his personal identity and connection with God. The speaker emphasizes that Jesus teaches with authority, not because he quotes from others, but because he has the power to make laws and declarations himself. This authority is demonstrated in various ways, including Jesus' teachings on truth and morality, his ability to command demons, and his power over the spirit realm. The takeaway is that Jesus' authority is unique and personal, and it is not something that can be replicated by humans through ritual or formula.