Catechism of the Catholic Church §1959 — excerpt
The natural law, the Creator's very good work, provides the solid foundation on which man can build the structure of moral rules to guide his choices.
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.