Catechism of the Catholic Church §2766 — excerpt
But Jesus does not give us a formula to repeat mechanically. As in every vocal prayer, it is through the Word of God that the Holy Spirit teaches the children of God to pray to their Father.
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.