4 What is, “in the anger of consummation shall be declared consummations”? There is an anger of consummation, and there is an anger of consuming. For every vengeance of God is called anger: sometimes God avenges, to the end that He may make perfect; sometimes He avenges, to the end that He may condemn. How does He avenge, to the end that He may make perfect? “He scourges every son whom He receives.” How does He avenge, to the end that He may condemn? When He shall have set ungodly men on the left hand, and shall have said to them, “Go ye into fire everlasting, that has been prepared for the devil and his angels.” This is the anger of consuming, not that of consummation. But “there shall be declared consummations in the anger of consummation;” it shall be preached by the Apostles, that “where sin has abounded, grace shall much more abound,” and the weakness of man has belonged to the healing of humility. Those men thinking of this, and finding out and confessing their iniquities, “shall not be.” “Shall not be” what? In their pride.
5. “And they shall know how God shall have dominion of Jacob, and of the ends of the earth”. For before they thought themselves just men, because the Jewish nation had received the Law, because it had kept the commandments of God: it is proved to them that it has not kept them, since in the very commandments of God Christ it perceived not, because “blindness in part has happened to Israel.” Even the Jews themselves see that they ought not to despise the Gentiles, of whom they deemed as of dogs and sinners. For just as alike they have been found in iniquity, so alike they will attain unto salvation. “Not only to Jews,” says the Apostle, “but also even to Gentiles.” For to this end the Stone which the builders set at nought, has even been made for the Head of the corner, in order that two in itself It might join: for a corner does unite two walls. The Jews thought themselves exalted and great: of the Gentiles they thought as weak, as sinners, as the servants of demons, as the worshippers of idols, and yet in both was there iniquity. Even the Jews have been proved sinners; because “there is none that does good, there is not even so much as one:” they have laid down their pride, and have not envied the salvation of the Gentiles, because they have known their own and their weakness to be alike: and in the Corner Stone being united, they have together worshipped the Lord....
6. “They shall be converted at evening”: that is, even if late, that is, after the slaying of our Lord Jesus Christ: “They shall be converted at evening: and hereafter they shall suffer hunger as dogs.” But “as dogs,” not as sheep or calves: “as dogs,” as Gentiles, as sinners; because they too have known their sin that thought themselves righteous....It is a good thing therefore for a sinner to be humbled; and no one is more incurable than he that thinks himself whole. “And they shall go around the city.” Already we have explained “city;” it is the “city of standing round;” all nations.
7. “They shall be scattered abroad in order that they may eat”; that is, in order that they may gain others, in order that into their Body they may change believers. “But if they shall not be filled, they shall murmur.” Because above also he had spoken of the murmur of them, saying, “For who has heard?” “And You, O Lord,” he says, “shall deride them, saying, Who has heard?” Wherefore? Because, as nothing You shall count all nations. Let the Psalm be concluded. See ye the Corner exulting, now with both walls rejoicing. The Jews were proud, humbled they have been; Gentiles were despairing, raised up they have been: let them come to the Corner, there let them meet, there run together, there find the kiss of peace; from different parts let them come, but with differing not come, those of Circumcision, these of uncircumcision. Far apart were the walls, but before that to the Corner they came: but in the Corner let them hold themselves, and now let the whole Church from both walls, say what? “But I will sing of Your power, and I will exult in the morning of Your mercy”. In the morning when temptations have been overcome, in the morning when the night of this world shall have passed away; in the morning when no longer the lyings in wait of robbers and of the devil and of his angels we dread, in the morning when no longer by the lamp of prophecy we walk, but Himself the Word of God as it were a Sun we contemplate. “And I will exult in the morning of Your mercy.” With reason in another Psalm is said, “In the morning I will stand by You, and I will meditate.” With reason also of the Lord Himself the Resurrection was at dawn, that there should be fulfilled that which has been said in another Psalm, “In the evening shall tarry weeping and in the morning exultation.” For at even the disciples mourned our Lord Jesus Christ as dead, at dawn at Him rising again they exulted. “For You have become my taker up, and my refuge in the day of my tribulation.”
8. “My Helper, to You I will play, because Thou, O God, art my taker up”. What was I, unless You succoured? How much despaired of was I, unless You healed? Where was I lying, unless You came to me? Certes with a huge wound I was endangered, but that wound of mine did call for an Almighty Physician. To an Almighty Physician nothing is incurable....Lastly, thinking of all good things whatsoever we may have, either in nature or in purpose, or in conversion itself, in faith, in hope, in charity, in good morals, in justice, in fear of God; all these to be only by His gifts, he has thus concluded: “My God is my mercy:” He being filled with the good things of God has not found what he might call his God, save “his mercy.” O name, under which no one must despair! If you say, my salvation, I perceive that He gives salvation; if you say, my refuge, I perceive that you take refuge in Him; if you say, my strength, I perceive that He gives to you strength: “my mercy,” is what? All that I am is of Your mercy....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)