Catechism of the Catholic Church §1789 — excerpt
Some rules apply in every case: - One may never do evil so that good may result from it; - the Golden Rule: "Whatever you wish that men would do to you, do so to them."
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.