Read literally, these verses promise the permanent restoration of the Davidic throne and (of the Levitical priesthood. As a matter of fact Zedekiah was the last king of David’s line, and the Levitical priest-hood has long passed away. Both these changes Jeremiah himself foretold Jeremiah 22:30; Jeremiah 3:16. In what way then is this apparent contradiction (compare Isaiah 66:20-23; Ezek. 40–48) to be explained? The solution is probably as follows. It was necessary that the Bible should be intelligible to the people at the time when it was written, and in some degree to the writer. The Davidic kingship and the Levitical priest-hood were symbols, which represented to the Jew all that was most dear to his heart in the state of things under which he lived. Their restoration was the restoration of his national and spiritual life. Neither was so restored as to exist permanently. But that was given instead, of which both were types, the Church, whose Head is the true prophet, priest and King.
Related Commentaries of Jeremiah 33:17
Jeremiah 33:17-18
17 For thus saith the LORD; Davida shall never want a man to sit upon the throne of the house of Israel;
18 Neither shall the priests the Levites want a man before me to offer burnt offerings, and to kindle meat offerings, and to do sacrifice continually.