2 Nor is this the only Psalm which has an inscription of such sort, that the Title be not corrupted. Several Psalms thus are marked on the face, but however in all the Passion of the Lord is foretold. Therefore here also let us perceive the Lord's Passion, and let there speak to us Christ, Head and Body. So always, or nearly always, let us hear the words of Christ from the Psalm, as that we look not only upon that Head, the one mediator between God and man, the Man Christ Jesus....But let us think of Christ, Head and whole Body, a sort of entire Man. For to us is said, “But you are the Body of Christ and members,” by the Apostle Paul. If therefore He is Head, we Body; whole Christ is Head and Body. For sometimes you find words which do not suit the Head, and unless you shall have attached them to the Body, your understanding will waver: again you find words which are proper for the Body, and Christ nevertheless is speaking. In that place we must have no fear lest a man be mistaken: for quickly he proceeds to adapt to the Head, that which he sees is not proper for the Body....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)