Rhetorical: The movement of this discourse is artfully turned in these two verses. The discussion begins because there are disputations, and baptism is the one that is discussed. Jesus notes that contention is of the devil, not of him. In these two verses, he creates a contrast between the contentions and doctrine. The shift in the discourse is signaled by the paired phrasing “this is not my doctrine” and “I will declare unto you my doctrine.” As the doctrine is presented, it returns to the theme of repentance and baptism, but now not as the subject of contention, but the heart of Jesus’ doctrine.