"Let us not seek to satisfy our thirst for freedom by drinking from the cup of bitterness and hatred. We must ever conduct our struggle on the high plane of dignity and discipline. We must not allow our creative protest to degenerate into physical violence. Again and again we must rise to the majestic heights of meeting physical force with soul force."

Martin Luther King, from “I Have a Dream” speech at March on Washington for Jobs and Freedom, August 28, 1963, Washington, D.C.