Catechism of the Catholic Church §2104 — excerpt
"All men are bound to seek the truth, especially in what concerns God and his Church, and to embrace it and hold on to it as they come to know it."
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.
Whole chapters cited: Nahum 2
Also cites: DH 1 # 2 · DH 2 # 1 · DH 14 # 4