This sermon untangles the controversies over the prophecy of Jesus being from Nazareth, the prophetic significance of being a Nazarene, the connection to all the passages describing the coming Messiah as "the branch," and more.
This short paragraph gives 1) a profound Christology and 2) an apologetic against Judaism. Jesus alone can be invested with regal authority because Jesus alone fulfills all the Messianic prophecies.