1....This Psalm is entitled, “A Psalm of David's, when his land was restored.” Let us refer the whole to Christ, if we wish to keep the road of a right understanding: let us not depart from the corner stone, lest our understanding suffer a fall: in Him let that become fixed, which wavered with unstable motion; let that rest upon Him, which before was waving to and fro in uncertainty. Whatever doubt a man has in his mind when he hears the Scriptures of God, let him not depart from Christ; when Christ has been revealed to him in the words, let him then be assured that he has understood; but before he arrives at the understanding of Christ, let him not presume that he has understood. “For Christ is the end of the law for righteousness to every one that believes.” What does this mean, and how are these words understood in Christ, “When his land was restored”?...
Source: The Enarrations, or Expositions, on the Psalms (New Advent)