Martin Luther King Jr., from a speech delivered exactly one year before he was assassinated in Memphis, Tenn.:
"This business of burning human beings with napalm, of filling our nation's homes with orphans and widows, of injecting poisonous drugs of hate into veins of peoples normally humane, of sending men home from dark and bloody battlefields physically handicapped and psychologically deranged, cannot be reconciled with wisdom, justice and love." -- Martin Luther King Jr, speech at Riverside Church in New York City, April 4, 1967.
Editor's note: A link to the online text and audio of his full speech is here.