Catechism of the Catholic Church §54 — excerpt
"God, who creates and conserves all things by his Word, provides men with constant evidence of himself in created realities. and furthermore, wishing to open up the way to heavenly salvation - he manifested himself to our first parents from the very beginning."
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: DV 3