1 The solemn day of the Martyrs has dawned; therefore to the glory of the Passion of Christ, the Captain of Martyrs, who spared not Himself, ordering His soldiers to the fight; but first fought, first conquered, that their fighting He might encourage by His example, and aid with His majesty, and crown with His promise: let us hear somewhat from this Psalm pertaining to His Passion. I commend unto you oftentimes, nor grieve I to repeat, what for you is useful to retain, that our Lord Jesus Christ speaks often of Himself, that is, in His own Person, which is our Head; often in the person of His Body, which are we and His Church; but so that the words sound as from the mouth of one, that we may understand the Head and the Body to consist together in the unity of integrity, and not be separated the one from the other; as in that marriage whereof it is said, “They two shall be one flesh.” If then we acknowledge two in one flesh, let us acknowledge two in one voice. First, that which responding to the reader we have sung, though it be from the middle of the Psalm, from that I will take the beginning of this Sermon.
“Mine enemies speak evil of Me, When He shall die, then shall His Name perish”. This is the Person of our Lord Jesus Christ: but see if herein are not understood the members also. This was spoken also when our Lord Himself walked in the flesh here on earth....When they saw the people go after Him, they said, “When He shall die, then shall His Name perish;” that is, when we have slain Him, then shall His Name be no more in the earth, nor shall He seduce any, being dead; but by that very slaying of Him shall men understand, that He was but a man whom they followed, that there was in Him no hope of salvation, and shall desert His Name, and it shall no more be. He died, and His Name perished not, but His Name was sown as seed: He died, but He was a grain, which dying, the grain immediately sprang up. When glorified then was our Lord Jesus Christ, began they much more, and much more numerously to trust in Him; then began His members to hear what the Head had heard. Now then our Lord Jesus Christ being in heaven set down, and Himself in us labouring on earth, still spoke His enemies, “When He shall die, then shall His Name perish.” For hence stirred up the devil persecutions in the Church to destroy the Name of Christ. Unless haply ye think, brethren, that those Pagans, when they raged against Christians, said not this among themselves, “to blot out the Name of Christ from the earth.” That Christ might die again, not in the Head, but in His Body, were slain also the Martyrs. To the multiplying of the Church availed the Holy Blood poured forth, to help Its seminating came also the death of the Martyrs. “Precious in the sight of the Lord is the death of His Saints.” More and more were the Christians multiplied, nor was it fulfilled which spoke the enemies, “When He shall die, then shall His Name perish.” Even now also is it spoken. Down sit the Pagans, and compute them the years, they hear their fanatics saying, A time shall come when Christians shall be none, and those idols must be worshipped as before they were worshipped: still say they, “When He shall die, then shall His Name perish.” Twice conquered, now the third time be wise! Christ died, His Name has not perished: the Martyrs died, multiplied more is the Church, grows through all nations the Name of Christ. He who foretold of His own Death, and of His Resurrection, He who foretold of His Martyrs' death, and of their crown, He Himself foretold of His Church things yet to come, if truth He spoke twice, has He the third time lied? Vain then is what ye believe against Him; better is it that you believe in Him, that you may “understand upon the needy and poor One;” that “though He was rich, yet for your sakes He became poor, that you through His poverty might be rich.”...
2. “Blessed is he that understands upon the needy and poor One: in the evil day shall the Lord deliver him”. For the evil day will come: will thou, nill thou, come it will: the Day of Judgment will come upon you, an evil day if you “understand not the needy and poor.” For what now you will not believe, shall be made manifest in the end. But neither shall you escape, when it shall be made manifest, because you believe not, when it is kept secret. Invited are you, what you see not to believe, lest when thou see, thou be put to the blush. “Understand then upon the needy and poor One,” that is, Christ: understand in Him the hidden riches, whom poor you see, “In Him are hid all the treasures of wisdom and knowledge.” For thereby in the evil day shall He deliver you, in that He is God: but in that He is man, and that which in Him is human has raised to life, and changed for the better, He has lifted (you) to heaven. But He who is God, who would have one person in man and with man, could neither decrease nor increase, neither die nor rise again. He died out of man's infirmity, but God dies not....But as we rightly say, Such a man died, though his soul dies not; so we rightly say, Christ died, though His Divinity dies not. Wherefore died? Because needy and poor. Let not His death offend you, and avert you from beholding His Divinity. “Blessed is he that understands upon the needy and poor One.” Consider also the poor, the needy, the hungry and thirsty, the naked, the sick, the prisoners; understand also upon such poor, for if upon such thou understand, you understand upon Him who said, “I was an hungred, I was thirsty, I was a stranger, naked, sick, in prison;” so in the evil day shall the Lord deliver you....
3. “And deliver him not into the hand of his enemy”. The enemy is the devil. Let none think of a man his enemy, when he hears these words. Haply one thought of his neighbour, of him who had a suit with him in court, of him who would take from him his own possession, of him who would force him to sell to him his house. Think not this; but that enemy think of, of whom said the Lord, “an enemy has done this.” For He it is who suggests that for things earthly he be worshipped, for overthrow the Christian Name this enemy cannot. For he has seen himself conquered by the fame and praises of Christ, he has seen, whereas he slew Christ's Martyrs, that they are crowned, he triumphed over. He has begun to be unable to persuade men that Christ is nought; and because by reviling Christ, he now with difficulty deceives, by lauding Christ, he endeavours to deceive. Before this what said he? Whom do you worship? A Jew, dead, crucified, a man of no moment, who could not even from himself drive away death. When after His Name he saw running the whole human race, saw that in the Name of the Crucified temples are thrown down, idols are broken, sacrifices abolished; and that all these things predicted in the Prophets are considered by men, by men with wonder astonished, and closing now their hearts against the reviling of Christ; he clothes himself with praise of Christ, and begins to deter from the faith in another manner. Great is the law of Christ, powerful is that law, divine, ineffable! But who fulfills it? In the name of our Saviour, “tread upon the lion and the dragon.” By reviling openly roared the lion; by lauding craftily lurks the dragon. Let them come to the faith, who doubted; and not say, Who fulfills it? If on their own strength they presume, they will not fulfil it. Presuming on the grace of God let them believe, presuming (on it) let them come; to be aided come, not to be judged. So live all the faithful in the Name of Christ, each one in his degree fulfilling the commands of Christ, whether married, or celibates and virgins, they live as much as God grants them to live; neither presume they in their own strength, but know that in Him they ought to glory....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)