“Egyptians have inspired us, and they’ve done so by putting the lie to the idea that justice is best gained through violence.  For in Egypt, it was the moral force of nonviolence — not terrorism, not mindless killing — but nonviolence, moral force that bent the arc of history toward justice once more.”

1960s, Nobel Prize acceptance speech (1964)
Context: Nonviolence is the answer to the crucial political and moral questions of our time — the need for mankind to overcome oppression and violence without resorting to violence and oppression. Civilization and violence are antithetical concepts… Sooner or later all the people of the world will have to discover a way to live together in peace, and thereby transform this pending cosmic elegy into a creative psalm of brotherhood. If this is to be achieved, man must evolve for all human conflict a method which rejects revenge, aggression and retaliation. The foundation of such a method is love.

1968: The Year That Rocked the World

1960s, Keep Moving From This Mountain (1965)
Context: We’ve got to move on to the point of seeing that on the international scale, war is obsolete -- that it must somehow be cast into unending limbo. But in a day when Sputniks and Explorers are dashing through outer space and guided ballistic missiles are carving highways of death through the stratosphere, no nation can win a war. It is no longer a choice between violence and nonviolence; it is either nonviolence or nonexistence. And the alternative to disarmament, the alternative to a greater suspension of nuclear tests, the alternative to strengthening the United Nations and thereby disarming the whole world may well be a civilization plunged into the abyss of annihilation. And so we must rise up and beat our swords into plowshares, and our spears into pruning hooks and nations must not rise up against nations, neither must they study war anymore.

2000s, Progressive magazine interview (2003)
Context: Once you follow a path of nonviolence and social justice, it won't take you long before you come into conflict with the culture, with the society. You can't know what is at stake or how much it is going to cost you until you get in the game. That's the only way, and the level of cost is equal to the level of involvement.

2013, "Let Freedom Ring" Ceremony (August 2013)
Context: p>But we would do well to recall that day itself also belonged to those ordinary people whose names never appeared in the history books, never got on TV. Many had gone to segregated schools and sat at segregated lunch counters. They lived in towns where they couldn’t vote and cities where their votes didn’t matter. They were couples in love who couldn’t marry, soldiers who fought for freedom abroad that they found denied to them at home. They had seen loved ones beaten, and children fire-hosed, and they had every reason to lash out in anger, or resign themselves to a bitter fate.And yet they chose a different path. In the face of hatred, they prayed for their tormentors. In the face of violence, they stood up and sat in, with the moral force of nonviolence. Willingly, they went to jail to protest unjust laws, their cells swelling with the sound of freedom songs. A lifetime of indignities had taught them that no man can take away the dignity and grace that God grants us. They had learned through hard experience what Frederick Douglass once taught -- that freedom is not given, it must be won, through struggle and discipline, persistence and faith.</p

Source: Stride Toward Freedom: The Montgomery Story

2013, "Let Freedom Ring" Ceremony (August 2013)
Context: To dismiss the magnitude of this progress -- to suggest, as some sometimes do, that little has changed -- that dishonors the courage and the sacrifice of those who paid the price to march in those years. Medgar Evers, James Chaney, Andrew Goodman, Michael Schwerner, Martin Luther King Jr. -- they did not die in vain. Their victory was great. But we would dishonor those heroes as well to suggest that the work of this nation is somehow complete. The arc of the moral universe may bend towards justice, but it doesn’t bend on its own. To secure the gains this country has made requires constant vigilance, not complacency. Whether by challenging those who erect new barriers to the vote, or ensuring that the scales of justice work equally for all, and the criminal justice system is not simply a pipeline from underfunded schools to overcrowded jails, it requires vigilance. And we'll suffer the occasional setback. But we will win these fights. This country has changed too much. People of goodwill, regardless of party, are too plentiful for those with ill will to change history’s currents.

p 139
The Better Angels of our Nature (2011)