Jamieson, Fausset and Brown on Esther 10:2

2. the declaration of the greatness of Mordecai--The experience of this pious and excellent Jew verified the statement, "he that humbleth himself shall be exalted" [Mt 23:12; Lu 14:11; 18:14]. From sitting contentedly at the king's gate, he was raised to the dignity of highest subject, the powerful ruler of the kingdom. Acting uniformly on the great principles of truth and righteousness, his greatness rested on a firm foundation. His faith was openly avowed, and his influence as a professor of the true religion was of the greatest usefulness for promoting the welfare of the Jewish people, as well as for advancing the glory of God.