CCC 38

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 the present condition of the human race, they can be known by all men with ease, with firm certainty and with no admixture of error".¹⁴ Pius XII, Humani generis 561: DS 3876DS — Denzinger–Schönmetzer (Enchiridion Symbolorum); cf. Dei Filius 2: DS 3005DS — Denzinger–Schönmetzer (Enchiridion Symbolorum); DV 6; St. Thomas Aquinas, S Th I, I, I.