Catechism of the Catholic Church §1963 — excerpt
According to Christian tradition, the Law is holy, spiritual, and good, yet still imperfect. Like a tutor it shows what must be done, but does not of itself give the strength, the grace of the Spirit, to fulfill it.
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.
Whole chapters cited: Romans 7