Catechism of the Catholic Church §2722 — excerpt
Vocal prayer, founded on the union of body and soul in human nature, associates the body with the interior prayer of the heart, following Christ's example of praying to his Father and teaching the Our Father to his disciples.
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.