Here’s St. Augustine’s comments on a psalm:

“Sing to the Lord a new song; his praise is in the assembly of the saints. We are urged to sing a new song to the Lord, as new people who have learned a new song. A song is a thing of joy; more profoundly, it is a thing of love. Anyone, therefore, who has learned to love the new life has learned to sing a new song, and the new song reminds us of our new life. The new person, the new song, the new covenant, all belong to the one kingdom of God, and so the new people will sing a new song and will belong to the new covenant.

“There is not one who does not love something, but the question is, what to love. The psalms do not tell us not to love, but to choose the object of our love. But how can we choose unless we are first chosen? We cannot love unless someone has loved us first. Listen to the apostle John: We love him, because he first loved us. The source of our love for God can only be found in the fact that God loved us first. He has given us himself as the object of our love, and he has also given us its source. What this source is you may learn more clearly from the apostle Paul who tells us: The love of God has been poured into our hearts. This love is not something we generate ourselves; it comes to us through the Holy Spirit who has been given to us.

“Since we have such an assurance, then, let us love God with the love he has given us. As John tells us more fully: God is love, and whoever dwells in love dwells in God, and God in him. It is not enough to say: Love is from God. Which of us would dare to pronounce the words of Scripture: God is love? He alone could say it who knew what it was to have God dwelling within him. God offers us a short route to the possession of himself. He cries out: Love me and you will have me for you would be unable to love me if you did not possess me already.”