One of the unique things about this book is that it takes place entirely outside of Israel. An even stranger thing is that it never mentions the name of God! This is not an accident, and it helps us to understand what the author wanted to communicate. In short, the story of Esther teaches that God takes care of his people even when he doesn’t do obvious “miracles,” and even if his people are not faithful to him. The book of Esther is really the story of the Jewish people for the last 2,500 years: even though they have not been obedient to his word, God still protects them and he will certainly fulfill all of the promises that he has made to them.
What are those promises? These are the ones he made to Abraham in Genesis 12, 15, 17 and to David in 2 Samuel 7. And they are the ones that were given through the prophets in the books you will be reading soon. God has promised to save his people, bring them back to live in the land of Israel, and to bless them beyond their wildest dreams. God has still not fulfilled those promises, but it is getting close to the time when he will. I wonder how many times God has protected the Jewish people like the way he did in this book.