Daniel 10:13
13. prince of . . . Persia—the angel of darkness that represented the Persian world power, to which Israel was then subject. This verse gives the reason why, though Daniel's "words were heard from the first day" (Da 10:12), the good angel did not come to him until more than three weeks had elapsed (Da 10:4).
one and twenty days—answering to the three weeks of Daniel's mourning (Da 10:2). Michael—that is, "Who is like God?" Though an archangel, "one of the chief princes," Michael was not to be compared to God. help me—Michael, as patron of Israel before God (Da 10:21; 12:1), "helped" to influence the Persian king to permit the Jews' return to Jerusalem. I remained—I was detained there with the kings of Persia, that is, with the angel of the Persian rulers, with whom I had to contend, and from whom I should not have got free, but for the help of Michael. GESENIUS translates, "I obtained the ascendency," that is, I gained my point against the adverse angel of Persia, so as to influence the Persian authorities to favor Israel's restoration. Daniel 10:20-21
20. Knowest thou wherefore—The angel asks, after Daniel had recovered from his fright, whether he has understood what was revealed (Da 10:13). On Daniel, by his silence, intimating that he did understand, the angel declares he will return to renew the fight with the evil angel, the prince of Persia. This points to new difficulties to the Jews' restoration which would arise in the Persian court, but which would be counteracted by God, through the ministry of angels.
prince of Grecia shall come—Alexander the Great, who conquered Persia, and favored the Jews [CALVIN]. Rather, as the prince of Persia is an angel, representing the hostile world power, so the prince of Grecia is a fresh angelic adversary, representing Greece. When I am gone forth from conquering the Persian foe, a fresh one starts up, namely, the world power that succeeds Persia, Greece; Antiochus Epiphanes, and his antitype Antichrist, but him, too, with the help of Michael, Israel's champion, I shall overcome [GEJER].21. noted in the scripture of truth—in the secret book of God's decrees (Ps 139:16; Re 5:1), which are truth, that is, the things which shall most surely come to pass, being determined by God (compare Joh 17:17).
none . . . but Michael—To him alone of the angels the office of protecting Israel, in concert with the angelic speaker, was delegated; all the world powers were against Israel.