Darkness cannot drive out darkness - Martin Luther King Jr.

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.

- Martin Luther King Jr.