Impose silence, therefore, upon the detractor, if he be your inferior or one whom you can reprove without offense. If you cannot do this, prudently endeavor to turn the conversation, or show by the severity of your countenance that his conversation is not pleasing to you. Beware of hearing the detractor with smiling attention, for you thus encourage him, and consequently share in his guilt. It is a grievous offense to set fire to a house, but it is scarcely less culpable to stand idly by witnessing its destruction instead of aiding in extinguishing the flames.
--Louis de Granada,
The Sinner's Guide
