Catechism of the Catholic Church §2126 — excerpt
Atheism is often based on a false conception of human autonomy, exaggerated to the point of refusing any dependence on God. Yet, "to acknowledge God is in no way to oppose the dignity of man, since such dignity is grounded and brought to perfection in God...."
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: GS 20 # 1 · GS 21 # 3 · GS 21 # 7