Every vice leads to cruelty. Even a good emotion, pity, if not controlled by charity and justice, leads through anger to cruelty. Most atrocities are stimulated by accounts of the enemy's atrocities; and pity for the oppressed classes, when separated from the moral law as a whole, leads by a very natural process to the unremitting brutalities of a reign of terror.
C.S. Lewis, The Problem of Pain
atrocity, vice, virtue