Catechism of the Catholic Church §2610 — excerpt
Just as Jesus prays to the Father and gives thanks before receiving his gifts, so he teaches us filial boldness: "Whatever you ask in prayer, believe that you receive it, and you will."
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.