Roman Catechism 24.3

Chapter 24 — Part III: The Decalogue — The First Commandment

Section 3. Against every temptation, therefore, the faithful should arm themselves with these words of the Apostle as with a shield: Shall we who are dead to sin live any longer therein? We are no longer our own, we are His who died and rose again for us. He is the Lord our God who has purchased us for Himself at the price of His blood. Shall we then be any longer capable of sinning against the Lord our God, and crucifying Him again? Being made truly free, and with that liberty wherewith Christ has made us free, let us, as we heretofore yielded our members to serve injustice, henceforward yield them to serve justice to sanctification.