Give the king your judgments, O God, and your righteousness unto the king's son.
Read Chapter 72
Augustine of Hippo
AD 430
2. "O God, Thy judgment to the King give Thou, and Thy justice to the King's Son" (ver. 1). The Lord Himself in the Gospel saith, "The Father judgeth not any one, but all judgment He hath given to the Son:" this is then, "O God, Thy judgment to the King give Thou." He that is King is also the Son of the King: because God the Father also is certainly King. Thus it hath been written, that the King made a marriage for His Son. But after the manner of Scripture the same thing is repeated. For that which he hath said in, "Thy judgment;" the same he hath otherwise expressed in, "Thy justice:" and that which he hath said in, "the King," the same he hath otherwise expressed in, "to the King's Son."... But these repetitions do much commend the divine sayings, whether the same words, or whether in other words the same sense be repeated: and they are mostly found in the Psalms, and in the kind of discourse whereby the mind's affection is to be awakened.
1. "For Salomon" indeed this Psalm's title is fore-noted: but things are spoken of therein which could not apply to that Salomon king of Israel after the flesh, according to those things which holy Scripture speaketh concerning him: but they can most pertinently apply to the Lord Christ. Whence it is perceived, that the very word Salomon is used in a figurative sense, so that in him Christ is to be taken. For Salomon is interpreted peace-maker: and on this account such a word to Him most truly and excellently cloth apply, through Whom, the Mediator, having received remission of sins, we that were enemies are reconciled to God. For "when we were enemies we were reconciled to God through the death of His Son." The Same is Himself that Peace-maker. ...Since then we have found out the true Salomon, that is, the true Peacemaker: next let us observe what the Psalm doth teach concerning Him.
Son. Solomon, (Berthier) or Cyrus, (Pr. disc.) or the Messias. Most blessed Trinity, enable the Son of man, or of David, to judge the world. (Worthington) (Isaias x. 3., and John v. 22.)
Judgment. Equity is the duty of governors, as obedience is that of subjects. Solomon acted with the greatest sagacity, 1 Paralipomenon xxii. 10., and xxix. 23., and 2 Paralipomenon i. 10. The psalmist inculcates the obligation of defending the rights of the poor, who are under God's protection. To him even judges and monarchs must give an account, Deuteronomy i. 17., and 2 Paralipomenon xix. 6.
Psalm. Some copies add, "of David. "But the Hebrew has only Lishlomo, "to Solomon "(St. Jerome; Haydock) or, composed by Solomon. The former sense is more generally adopted, (Berthier) though the Chaldean and Eusebius look upon the latter as most plausible. David, however, seems to have written this last most beautiful piece, when he placed his son upon the throne; (3 Kings i. 47.) and being transported with a divine enthusiasm, he described the reign of the Messias, (Calmet) to whom alone many of the passages can be applied, (St. Augustine; Worthington) as the Jews, Chaldean, Kimchi, confess, though they will not allow Jesus to be the Christ, ver. 5, 11, 17. (Calmet)