The visions ended and Zechariah awoke from his dream-like state. What follows is a symbolic act that took place in Jerusalem at the Lord"s command. [source][source][source]
"The position of this actual ceremony after the eight visions is significant. The fourth and fifth visions, at the center of the series, were concerned with the high priest [1] and the civil governor in the Davidic line [2]. Zechariah here linked the message of those two visions to the messianic King-Priest.... Thus restored Israel is seen in the future under the glorious reign of the messianic King-Priest." [3][source]
"Immediately following the overthrow of Gentile world power by the earth judgments symbolized by the horsed chariots ( Zechariah 6:1-8) occurs the manifestation of Christ in His kingdom glory ( Zechariah 6:9-15) typified by the crowning of Joshua the high priest. This is the usual prophetic order: first, the judgments of the day of the Lord; then full kingdom blessing ( Psalm 2:5, cf. Psalm 2:6; Isaiah 3:24-26; cf. Isaiah 4:2-6; Isaiah 10:33-34; cf. Isaiah 11:1-10; Revelation 19:19-21; cf. Revelation 20:4-6). [source][source][source]
"The eight night visions have ended, but the coronation of Joshua is closely connected with these revelations which extend in scope from Zechariah"s day to the full establishment of Israel in blessing. The crowning of King-Priest Messiah is thus set forth symbolically by the coronation of Joshua , which is not a vision, but an actual historical Acts , which evidently took place the day following the night of visions." [4][source]
". . . this oracle serves as a comment on and climax to the night visions as a whole." [5][source]
Some commentators connect this oracle with the preceding vision as the other oracles in chapters1 , 2 , and4connect with the visions in their contexts. [5] Nevertheless even these writers acknowledge that this oracle was not originally part of the vision in Zechariah 6:1-8 but supplements the earlier mention of the Branch in Zechariah 3:8. [source][source][source]
"Unlike vision one, number eight does not have its own oracle of response, though ... the oracle that follows it ( Zechariah 6:9-15) may serve it as such as well as bringing the whole series to an end." [7][source]
The lesson that this symbolic act illustrated was that Messiah would appear as a king-priest and rebuild God"s temple in the days of Israel"s future restoration (i.e, the Millennium). [source][source][source]
"This is one of the most remarkable and precious Messianic prophecies, and there is no plainer prophetic utterance in the whole Old Testament as to the Person of the promised Redeemer, the offices He was to fill, and the mission He was to accomplish." [8][source]