Catechism of the Catholic Church §2542 — excerpt
The Law entrusted to Israel never sufficed to justify those subject to it; it even became the instrument of "lust." The gap between wanting and doing points to the conflict between God's Law which is the "law of my mind," and another law "making me…
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.