2:21-23 Good subjects must not conceal any bad design they know of against the prince, or the public peace. Mordecai was not rewarded at the time, but a remembrance was written. Thus, with respect to those who serve Christ, though their recompence is not till the resurrection of the just, yet an account is kept of their work of faith and labour of love, which God is not unrighteous to forget. The servant of God must be faithful to every trust, and watchful for those who employ him. If he appear to be neglected now, he will be remembered hereafter. None of our actions can be forgotten; even our most secret thoughts are written in lasting registers, Re 20:12.

Es 2:21-23. Mordecai, Discovering a Treason, Is Recorded in the Chronicles.

21. In those days … two of the king's chamberlains … were wroth and sought to lay hand on the king, &c.—This secret conspiracy against the king's life probably arose out of revenge for the divorce of Vashti, in whose interest, and at whose instigation, these eunuchs may have acted. Through the vigilance of Mordecai, whose fidelity, however, passed unnoticed, the design was frustrated, while the conspirators were condemned to be executed and as the matter was recorded in the court annals, it became the occasion afterwards of Mordecai's preferment to the place of power and influence for which, in furtherance of the national interests of the Jews, divine providence intended him.