1 Over the title of this Psalm, being so short and so simple, I think we need not tarry. But the prophecy which here we read sent before, we know to be evidently fulfilled. For when these things were being sung in the times of King David, nothing of such sort, by the hostility of the Gentiles, as yet had befallen the city Jerusalem, nor the Temple of God, which as yet was not even built. For that after the death of David his son Salomon made a temple to God, who is ignorant? That is spoken of therefore as though past, which in the Spirit was seen to be future.
“O God, the Gentiles have come into Your inheritance”. Under which form of expression other things which were to come to pass, are spoken of as having been done. Nor must this be wondered at, that these words are being spoken to God. For they are not being represented to Him not knowing, by whose revelation they are foreknown; but the soul is speaking with God with that affection of godliness, of which God knows. For even the things which Angels proclaim to men, they proclaim to them that know them not; but the things which they proclaim to God, they proclaim to Him knowing, when they offer our prayers, and in ineffable manner consult the eternal Truth respecting their actions, as an immutable law. And therefore this man of God is saying to God that which he is to learn of God, like a scholar to a master, not ignorant but judging; and so either approving what he has taught, or censuring what he has not taught: especially because under the appearance of one praying, the Prophet is transforming into himself those who should be at the time when these things were to come to pass. But in praying it is customary to declare those things to God which He has done in taking vengeance, and for a petition to be added, that henceforth He should pity and spare. In this way here also by him the judgments are spoken of by whom they are foretold, as if they were being spoken of by those whom they befell, and the very lamentation and prayer is a prophecy.
2. “They have defiled Your holy Temple, they have made Jerusalem for a keeping of apples.” “They have made the dead bodies of Your servants morsels for the fowls of heaven, the fleshes of Your saints for the beasts of the earth”. “They have poured forth their blood like water in the circuit of Jerusalem, and there was no one to bury them”. If in this prophecy any one of us shall have thought that there must be understood that laying waste of Jerusalem, which was made by Titus the Roman Emperor, when already the Lord Jesus Christ, after His Resurrection and Ascension, was being preached among the Gentiles, it does not occur to me how that people could now have been called the inheritance of God, as not holding to Christ, whom having rejected and slain, that people became reprobate, which not even after His Resurrection would believe in Him, and even killed His Martyrs. For out of that people Israel whosoever have believed in Christ; to whom the offer of Christ was made, and in a manner the healthful and fruitful fulfilment of the promise; concerning whom even the Lord Himself says, “I am not sent but to the sheep which have been lost of the house of Israel,” the same are they that out of them are the sons of promise; the same are counted for a seed; the same do belong to the inheritance of God. From hence are Joseph that just man, and the Virgin Mary who bore Christ: hence John Baptist the friend of the Bridegroom, and his parents Zacharias and Elisabeth: hence Symeon the old, and Anna the widow, who heard not Christ speaking by the sense of the body; but while yet an infant not speaking, by the Spirit perceived Him: hence the blessed Apostles: hence Nathanael, in whom guile was not: hence the other Joseph, who himself too looked for the kingdom of God: hence that so great multitude who went before and followed after His beast, saying, “Blessed is He that comes in the name of the Lord:” among whom was also that company of children, in whom He declared to have been fulfilled, “Out of the mouth of infants and sucklings You have perfected praise.” Hence also were those after His resurrection, of whom on one day three and on another five thousand were baptized, welded into one soul and one heart by the fire of love; of whom no one spoke of anything as his own, but to them all things were common. Hence the holy deacons, of whom Stephen was crowned with martyrdom before the Apostles. Hence so many Churches of Judæa, which were in Christ, unto whom Paul was unknown by face, but known for an infamous ferocity, and more known for Christ's most merciful grace. Hence even he, according to the prophecy sent before concerning him, “a wolf ravening, in the morning carrying off, and in the evening dividing morsels;” that is, first as persecutor carrying off unto death, afterwards as a preacher feeding unto life. These are they that are out of that people the inheritance of God....So then even at this time a remnant through election of Grace have been saved. This remnant out of that nation does belong to the inheritance of God: not those concerning whom a little below he says, “But the rest have been blinded.” For thus he says. “What then? That which Israel sought, this he has not obtained: but the election has obtained it: but the rest have been blinded.” This election then, this remnant, that people of God, which God has not cast off, is called His inheritance. But in that Israel, which has not obtained this, in the rest that were blinded, there was no longer an inheritance of God, in reference to whom it is possible that there should be spoken, after the glorification of Christ in the Heavens, in the time of Titus the Emperor, “O God, there have come the Gentiles unto Your inheritance,” and the other things which in this Psalm seem to have been foretold concerning the destruction of both the temple and city belonging to that people.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)