Catechism of the Catholic Church §2841 — excerpt
This petition is so important that it is the only one to which the Lord returns and which he develops explicitly in the Sermon on the Mount.
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.