I found this commentary with some insight into the book of Esther:
Background to the book of Esther
One of the things that stood out for me was the last verses in the reading:
(Emphasis in bold is mine)
How unfortunate it is that sometimes we can be consumed by our own pettiness that we cease to see all of the things that are good in our lives. Here was Haman--invited to a solo banquet with the King and the Queen and all he could focus on was the anger he felt towards someone who didn't do what he asked. Haman even goes so far as building a gallows for Mordecai--not knowing that it would be Haman himself using it.
We too can become consumed with our anger and our resentment that it causes us to overlook the good things in our lives. We become blind and can't see the goodness before us. If only Haman would have seen beyond his hatred towards Mordecai, he would have been able to enjoy his position of power instead of becoming greedy with power and having the desire to kill all of the Jews.
God is in control whether he is at the forefront of the story or working behind the scenes. We can trust Him to place the right people in the right place at the right time for such a time as this.
Tomorrow's Bible In a Year Passage: Esther 6-10