Catechism of the Catholic Church §47 — excerpt
The Church teaches that the one true God, our Creator and Lord, can be known with certainty from his works, by the natural light of human reason (cf.
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.