Tunc enim robustius contra vitia erigitur, cum subdita rationi famulatur. - Gregory the Great
Caedite eos. Novit enim Dominus qui sunt eius. ("Kill them all. For the Lord knoweth them that are His." Supposedly said when asked by a Crusader how to distinguish the Cathars from the Catholics.) - Bishop Arnold of Citeaux
In times of war, the law falls silent.Silent enim leges inter arma - Marcus Tullius Cicero