Catechism of the Catholic Church §2726 — excerpt
In the battle of prayer, we must face in ourselves and around us erroneous notions of prayer. Some people view prayer as a simple psychological activity, others as an effort of concentration to reach a mental void.
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.