Commentators unanimously explain that this verse establishes Jesus' absolute superiority by contrasting His origin with everyone else's. Jesus 'cometh from above,' meaning He is divine and heavenly. In contrast, John the Baptist, like all prophets and teachers, is 'of the earth.' This difference in origin means Jesus is supreme in nature, authority, and the clarity of His message. He isn't just another prophet; He is in a category all by Himself.