Catechism of the Catholic Church §2661 — excerpt
By a living transmission -Tradition - the Holy Spirit in the Church teaches the children of God to pray.
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.