Catechism of the Catholic Church §2756 — excerpt
Filial trust is put to the test when we feel that our prayer is not always heard. the Gospel invites us to ask ourselves about the conformity of our prayer to the desire of the Spirit.
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.