Catechism of the Catholic Church §2651 — excerpt
The tradition of Christian prayer is one of the ways in which the tradition of faith takes shape and grows, especially through the contemplation and study of believers who treasure in their hearts the events and words of the economy of salvation, and through their profound grasp of the spiritual realities they experience.
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.
Also cites: DV 8