Catechism of the Catholic Church §2596 — excerpt
The Psalms constitute the masterwork of prayer in the Old Testament. They present two inseparable qualities: the personal, and the communal. They extend to all dimensions of history, recalling God's promises already fulfilled and looking for the coming of the Messiah.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.