Catechism of the Catholic Church §2774 — excerpt
"The Lord's Prayer is truly the summary of the whole gospel," The "most perfect of prayers." It is at the center of the Scriptures.
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: Tertullian, De orat. 1 PL 1, 1251-1255 · St. Thomas Aquinas, STh II-II, 83, 9