Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that. Hate multiplies hate, violence multiplies violence, and toughness multiplies toughness in a descending spiral of destruction... The chain reaction of evil - hate begetting hate, wars producing more wars - must be broken or we shall be plunged into the dark abyss of annihilation.
Every man must decide whether he will walk in the light of creative altruism or the darkness of destructive selfishness. This is the judgment. Life's most persistent and urgent question is, what are you doing for others?