God told Jeremiah in chapter 32 to buy a field outside Jerusalem. The city had been under siege for a year, and Jeremiah bought land that the soldiers occupied -- certainly a poor investment. In addition, Jeremiah was a prisoner in the palace. But Jeremiah was demonstrating his faith in God's promises to bring his people back and to rebuild Jerusalem.
Trust doesn't come easy. It wasn't easy for Jeremiah to publicly buy land already captured by the enemy. But he trusted God. It wasn't easy for David to believe he would become king, even after he was anointed. But he trusted God (1 Samuel 16-31). It wasn't easy for Moses to believe that he and his people would escape Egypt, even after God spoke to him from a burning bush. But he trusted God (Exodus 3 - 4). It isn't easy for us to believe God can fulfill his "impossible" promises either, but we must trust him. God, who worked in the lives of Biblical heroes, will work in our lives too, if we will let him.
Jeremiah 33:15-16 refers to both the first and second coming of Christ. At his first coming he would set up his reign in the hearts of believers; at his second coming he would execute justice and righteousness throughout the whole earth. He is coming again. This is another reason for us to trust him.
Jeremiah 34 describes the fulfillment of many of Jeremiah's predictions. The people of Israel had a hard time keeping their promises to God. In the temple, they would solemnly promise to obey God, but back in their homes and at work they wouldn't do it. God expressed his great displeasure. If you want to please God, make sure you keep your promises. God wants promises lived out, not just piously made.
God told Jeremiah in chapter 36 to write his words on a scroll. Because he was not allowed to go to the temple, Jeremiah asked his scribe, Baruch, to whom he had dictated the scroll to read it to the people gathered there. Baruch then read it to the officials, and finally Jehudi read it to the kimg. Although the king burned the scroll, he could not destroy the word of God. Today many people try to put God's Word aside or say that it contains errors and therefore cannot be trusted. People may reject God's Word, but they cannot destroy it. God's Word will stand forever (Psalm 119:89). We should never forget this truth. This is another reason we can trust God. May you trust him today in whatever you face.