Never slander anyone either directly or indirectly. Beware of falsely imputing crimes and sins to your neighbor, revealing his secret sins, exaggerating those that are manifest, putting an evil interpretation on his good works, denying the good that you know belongs to someone or maliciously concealing it or lessening it by words. You would would offend God in all these ways but most of all by false accusations and denying the truth to your neighbor’s harm. It is a double sin to lie and harm your neighbor at the same time.
–Saint Francis de Sales (1567-1622)