“The question is whether any civilization can wage relentless war on life without destroying itself, and without losing the right to be called civilized.”

China, Past and Present (1972) Ch. 1

1960s, How Long, Not Long (1965)
Context: The Civil Rights Act of 1964 gave Negroes some part of their rightful dignity, but without the vote it was dignity without strength. Once more the method of nonviolent resistance was unsheathed from its scabbard, and once again an entire community was mobilized to confront the adversary. And again the brutality of a dying order shrieks across the land. Yet, Selma, Alabama, became a shining moment in the conscience of man. If the worst in American life lurked in its dark streets, the best of American instincts arose passionately from across the nation to overcome it. There never was a moment in American history more honorable and more inspiring than the pilgrimage of clergymen and laymen of every race and faith pouring into Selma to face danger at the side of its embattled Negroes.

Anatomy of Criticism: Four Essays (1957), Polemical Introduction

The trial of Charles B. Reynolds for blasphemy (1887)
Context: Liberty is the condition of progress. Without Liberty, there remains only barbarism. Without Liberty, there can be no civilization.
If another man has not the right to think, you have not even the right to think that he thinks wrong. If every man has not the right to think, the people of New Jersey had no right to make a statute, or to adopt a constitution — no jury has the right to render a verdict, and no court to pass its sentence.
In other words, without liberty of thought, no human being has the right to form a judgment. It is impossible that there should be such a thing as real religion without liberty. Without liberty there can be no such thing as conscience, no such word as justice. All human actions — all good, all bad — have for a foundation the idea of human liberty, and without Liberty there can be no vice, and there can be no virtue.
Without Liberty there can be no worship, no blasphemy — no love, no hatred, no justice, no progress.
Take the word Liberty from human speech and all the other words become poor, withered, meaningless sounds — but with that word realized — with that word understood, the world becomes a paradise.

JFK to Gore Vidal, quoted in David Swanson's Daybreak: Undoing the Imperial Presidency and Forming a More Perfect Union (2011).
Attributed

Speech to the Trades Union Congress in Bristol (9 September 1915), quoted in The Times (10 September 1915), p. 9
Minister of Munitions

Counterterrorism and Cybersecurity: Total Information Awareness (2nd Edition), 2015

The Ballot or the Bullet (1964), Speech in Cleveland, Ohio (April 3, 1964)
Context: We need to expand the civil-rights struggle to a higher level—to the level of human rights. Whenever you are in a civil-rights struggle, whether you know it or not, you are confining yourself to the jurisdiction of Uncle Sam. No one from the outside world can speak out in your behalf as long as your struggle is a civil-rights struggle. Civil rights comes within the domestic affairs of this country. All of our African brothers and our Asian brothers and our Latin-American brothers cannot open their mouths and interfere in the domestic affairs of the United States. And as long as it’s civil rights, this comes under the jurisdiction of Uncle Sam. But the United Nations has what’s known as the charter of human rights; it has a committee that deals in human rights. You may wonder why all of the atrocities that have been committed in Africa and in Hungary and in Asia, and in Latin America are brought before the UN, and the Negro problem is never brought before the UN. This is part of the conspiracy. This old, tricky blue eyed liberal who is supposed to be your and my friend, supposed to be in our corner, supposed to be subsidizing our struggle, and supposed to be acting in the capacity of an adviser, never tells you anything about human rights. They keep you wrapped up in civil rights. And you spend so much time barking up the civil-rights tree, you don’t even know there’s a human-rights tree on the same floor.

19 September 2013 during his speech at the Valdai forum
2013