Catechism of the Catholic Church §428 — excerpt
Whoever is called "to teach Christ" must first seek "the surpassing worth of knowing Christ Jesus"; he must suffer "the loss of all things. ."
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.