Synopsis of the Books of the Bible, by John Nelson Darby, [1857-62], at sacred-texts.com
Psalm 72 introduces us, not to David in suffering and conflict, but to the full reign of peace and royal blessing. It is the Son of David we have here, the source and securer of millennial blessings. I know not that this psalm requires much explanation by reason of its clearness. It is the king to whom God gives His judgments, and who is at the same time the king's Son, the Son of David, in His reign of righteousness and peace, as Solomon or Melchisedec. His kingdom has the full extent of promise, but all kings fall down before Him. Blessings of every kind accompany this reign of righteousness. The expression "prayer shall be made continually for him" shows simply, that the blessings enjoyed through Him raise the desire and request for His glory and continuance in power. While literally spoken of Solomon, I think it would point out Christ reigning as a true man upon earth. Verse 17 (Psa 72:17) shows, I think, it is not uncertainty of duration, but the effects of His rule on the hearts of all that are under it. There will be a prince of the house of David in Jerusalem, I suppose: still this, I think, looks beyond him.
This closes the Book. We have seen in it the godly ones cast out; their distress and confidence in this position; this ending in the certainty and confidence of restoration; and then Messiah's deliverance and exaltation and previous humiliation the glorious and yet humbled person being thus brought outand then the human royal rule established in Israel. This ends the dealings with the remnant in the land, looked at as apart from the rest.