Nebuchadnezzar didn't listen to God's instructions, and so God told him that he would be punished because of it, yet still gave him a chance to change his ways. Nebuchadnezzar still didn't listen, and so God punished him. But, after Nebuchadnezzar realized his mistakes, God showed him mercy and took away his punishment.
God has given us so much mercy and grace. It's amazing that He continues to forgive us after we wrong Him so many times.
The sad thing is, we don't forgive as easily as God. You would think we would, considering we have experienced forgiveness that we don't deserve. We need to forgive others just as our God forgave us.
God, help us to remember how great Your mercy and forgiveness is. And help us to show it to others, even if we don't think they deserve it. Because we don't deserve Your forgiveness, yet You still gave it to us. Thank You for Your unfailing love. Amen.