Catechism of the Catholic Church §2826 — excerpt
By prayer we can discern "what is the will of God" and obtain the endurance to do it. Jesus teaches us that one enters the kingdom of heaven not by speaking words, but by doing "the will of my Father in heaven."
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.