Catechism of the Catholic Church §2699 — excerpt
The Lord leads all persons by paths and in ways pleasing to him, and each believer responds according to his heart's resolve and the personal expressions of his prayer.
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.