Catechism of the Catholic Church §38 — excerpt
This is why man stands in need of being enlightened by God's revelation, not only about those things that exceed his understanding, but also "about those religious and moral truths which of themselves are not beyond the grasp of human reason, so that even in…
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.
Also cites: Pius XII, Humani generis 561: DS 3876 · Dei Filius 2: DS 3005 · DV 6 · St. Thomas Aquinas, S Th I, I, I