Matthew Henry Commentary Esther 8:15-17

"And Mordecai went forth from the presence of the king in royal apparel of blue and white, and with a great crown of gold, and with a robe of fine linen and purple: and the city of Shushan shouted and was glad. The Jews had light and gladness, and joy and honor. And in every province, and in every city, whithersoever the king`s commandment and his decree came, the Jews had gladness and joy, a feast and a good day. And many from among the peoples of the land became Jews; for the fear of the Jews was fallen upon them." — Esther 8:15-17 (ASV)

Mordecai's robes were now rich. These things are not noteworthy in themselves, but only as marks of the king's favor and the fruit of God's favor to His church. It is well with a land when ensigns of dignity are made the ornaments of serious piety. When the church prospers, many will join it who would be reluctant to do so when it is in trouble. When believers have rest, and walk in the fear of the Lord and in the comfort of the Holy Spirit, they will be multiplied. And the attempts of Satan to destroy the church always tend to increase the number of true Christians.