“We have faith that future generations will know that here, in the middle of the twentieth century, there came a time when men of good will found a way to unite, and produce, and fight to destroy the forces of ignorance, and intolerance, and slavery, and war.”

I Think I'll Sit This One Out (1939)
Context: It is a sensible military tactic to recognize the enemy before you shoot. The common enemy is the animality in man, and not the men here and there who are behaving like animals at the moment. Neither science nor prayer nor force will save us. What will save us is the reason that enables men, in ancient Israel and modern America, to choose between guns and butter, and to choose well. When we have produced men of reason, we shall have a world of reason, and the Hitlers will disappear. As long as we produce men of force we shall have a world of force, and the Hitlers, whoever wins the wars, will carry the day.
Society may make many demands on me, as long as it keeps me out of the cave. It may take my property. It may take my life. But when it puts me back into the cave I must say, politely but firmly, to hell with society. My ancestors were cannibals without benefit of parliaments.

As quoted in Louis Pasteur, Free Lance of Science (1960) by René Jules Dubos, Ch. 3 "Pasteur in Action"

"Niagara Movement Speech" (1905) http://teachingamericanhistory.org/library/document/niagara-movement-speech/ <!--originally a portion of this was cited here to an Address to the Nation speech at Harpers Ferry, Virginia (16 August 1906); published in the New York Times on (20 August 1906) — but that does not correspond with the info at the link. -->
Context: The school system in the country districts of the South is a disgrace and in few towns and cities are Negro schools what they ought to be. We want the national government to step in and wipe out illiteracy in the South. Either the United States will destroy ignorance or ignorance will destroy the United States.
And when we call for education we mean real education. We believe in work. We ourselves are workers, but work is not necessarily education. Education is the development of power and ideal. We want our children trained as intelligent human beings should be, and we will fight for all time against any proposal to educate black boys and girls simply as servants and underlings, or simply for the use of other people. They have a right to know, to think, to aspire.
These are some of the chief things which we want. How shall we get them? By voting where we may vote, by persistent, unceasing agitation; by hammering at the truth, by sacrifice and work.
We do not believe in violence, neither in the despised violence of the raid nor the lauded violence of the soldier, nor the barbarous violence of the mob, but we do believe in John Brown, in that incarnate spirit of justice, that hatred of a lie, that willingness to sacrifice money, reputation, and life itself on the altar of right. And here on the scene of John Brown’s martyrdom we reconsecrate ourselves, our honor, our property to the final emancipation of the race which John Brown died to make free.
Our enemies, triumphant for the present, are fighting the stars in their courses. Justice and humanity must prevail.

The Fat of the Land, from Hungry Hearts and Other Stories (1920)

Introduction, p. viii

As quoted in "No Sean Penn", by Andrew Leigh, National Review Online (5 March 2004) http://www.nationalreview.com/articles/209781/no-sean-penn/andrew-leigh

Source: Christianity and the Social Crisis (1907), Ch.4 Why Has Christianity Never Undertaken the Work of Social Reconstruction?, p. 149

Source: A Discourse on the Love of Our Country (1789), p. 13