Catechism of the Catholic Church §2735 — excerpt
In the first place, we ought to be astonished by this fact: when we praise God or give him thanks for his benefits in general, we are not particularly concerned whether or not our prayer is acceptable to him.
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.