Catechism of the Catholic Church §1147 — excerpt
God speaks to man through the visible creation. the material cosmos is so presented to man's intelligence that he can read there traces of its Creator.
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.