32 So “He gave them unto compassions, in the sight of all that had taken them captive”. That they might not be vessels of wrath, but vessels of mercy. The compassions unto which He gave them are named in the plural for this reason, I imagine, because each one has a gift of his own from God, one in one way, another in another. Come then, whosoever readest this, and dost recognise the grace of God, by which we are redeemed unto eternal life through our Lord Jesus Christ, by reading in the writings, and by searching in the Prophets, and see the Old Testament revealed in the New, the New veiled in the Old; remember the words of our Lord Jesus Christ, where, when He drives him out of the hearts of the faithful, He says, “Now is the prince of this world cast out:” and again of the Apostle, when he says, “Who has delivered us from the power of darkness, and has translated us into the kingdom of His dear Son.” Meditate on these and such like things, examine also the Old Testament, and see what is sung in that Psalm, the title of which is, When the temple was being built after the captivity: for there it is said, “Sing unto the Lord a new song.” And, that you may not think it does refer to the Jewish people only, he says, “Sing unto the Lord, all the whole earth: sing unto the Lord, and praise His Name: declare,” or rather, “give the good news of,” or, to transfer the very word used in the Greek, “evangelize day from day, His salvation.” Here the Gospel (Evangelium) is mentioned, in which is announced the Day that came from Day, our Lord Christ, the Light from Light, the Son from the Father. This also is the meaning of His salvation: for Christ is the Salvation of God, as we have shown above....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)