Catechism of the Catholic Church §1955 — excerpt
The "divine and natural" law shows man the way to follow so as to practice the good and attain his end. the natural law states the first and essential precepts which govern the moral life.
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 89 # 1 · St. Augustine, De Trin. 14, 15, 21: PL 42,1052 · St. Thomas Aquinas, Dec. praec. I