Though it’s the only book in the Bible that never mentions God, Esther conveys events with such perfect literary symmetry that a profound theological point is made: God’s providence is at work in everything on behalf of his people.
Joy is found in God Alone. God causes the Israelites to have joy and commit themselves to joyous praise. He teaches them where to locate their joy and how to have joy that isn’t based on feelings or circumstances but based on an everlasting relationship with Him.