What does the book of Jeremiah teach us?

Jeremiah 1:1 identifies the Prophet Jeremiah as the author of the Book of Jeremiah, written between 630 and 580 B.C. The Book of Jeremiah records the final prophecies to Judah, warning of oncoming destruction if the nation does not repent. Jeremiah calls for the nation to turn back to God. At the same time, Jeremiah recognizes the inevitability of Judah’s destruction due to its unrepentant idolatry and immorality.

The Book of Jeremiah is primarily a message of judgment on Judah for rampant idolatry (Jeremiah 7:30–34; 16:10–13; 22:9; 32:29; 44:2–3). After the death of King Josiah, the last righteous king, the nation of Judah had almost completely abandoned God and His commandments. Jeremiah compares Judah to a prostitute (Jeremiah 2:20; 3:1–3). God had promised that He would judge idolatry most severely (Leviticus 26:31–33; Deuteronomy 28:49–68), and Jeremiah was warning Judah that God’s judgment was at hand. God had delivered Judah from destruction on countless occasions, but His mercy was at its end. Jeremiah records King Nebuchadnezzar conquering Judah and making it subject to him (Jeremiah 24:1). After further rebellion, God brought Nebuchadnezzar and the Babylonian armies back to destroy and desolate Judah and Jerusalem (Jeremiah chapter 52). Even in this most severe judgment, God promises the restoration of Judah back into the land God had given them.

“For thus saith the Lord, That after seventy years be accomplished at Babylon I will visit you, and perform my good word toward you, in causing you to return to this place.” Jeremiah 29:10

Jeremiah 23, presents a prophecy of the coming Messiah, Jesus the Christ.

“Behold, the days come, saith the Lord, that I will raise unto David a righteous Branch, and a King shall reign and prosper, and shall execute judgment and justice in the earth. In his days Judah shall be saved, and Israel shall dwell safely: and this is his name whereby he shall be called, The Lord Our Righteousness.” Jeremiah 23:5–6