Jeremiah 32:41 Yea, I will rejoice over them to do them good, and I will plant them in this land assuredly with my whole heart and with my whole soul.
God is here talking about rejoicing over Israel and Judah, His people. He wants to do them good. He will do them good. He will reestablish them as a kingdom, a country. God has disciplined the country for its rebellion but never to harm them but to heal them.
The beautiful application you can draw from this is that He loves His people. He rejoices over His people. In Christ we are His people. He loves us with all of His heart. We can know that He is for us. We can rest in His blessed assurance.