“We should always be braced to defend justice against injustice at all costs. For once injustice becomes tolerable, then our liberties shall be dismantled.”

Narrated in Mosnad Ahmad, #5798, and Saheeh Al-Bukhari, #2447.
Sunni Hadith

Source: Discipleship (1937), Revenge, p. 141.
Context: The right way to requite evil, according to Jesus, is not to resist it. This saying of Christ removes the Church from the sphere of politics and law. The Church is not to be a national community like the old Israel, but a community of believers without political or national ties. The old Israel had been both — the chosen people of God and a national community, and it was therefore his will that they should meet force with force. But with the Church it is different: it has abandoned political and national status, and therefore it must patiently endure aggression. Otherwise evil will be heaped upon evil. Only thus can fellowship be established and maintained.
At this point it becomes evident that when a Christian meets with injustice, he no longer clings to his rights and defends them at all costs. He is absolutely free from possessions and bound to Christ alone. Again, his witness to this exclusive adherence to Jesus creates the only workable basis for fellowship, and leaves the aggressor for him to deal with.
The only way to overcome evil is to let it run itself to a stand-still because it does not find the resistance it is looking for. Resistance merely creates further evil and adds fuel to the flames. But when evil meets no opposition and encounters no obstacle but only patient endurance, its sting is drawn, and at last it meets an opponent which is more than its match. Of course this can only happen when the last ounce of resistance is abandoned, and the renunciation of revenge is complete. Then evil cannot find its mark, it can breed no further evil, and is left barren.

"Federalism, Socialism, Anti-Theologism" http://www.marxists.org/reference/archive/bakunin/works/various/reasons-of-state.htm, presented by Bakunin as a Reasoned Proposal to the Central Committee of the League for Peace and Freedom, at the League's first congress held in Geneva (September 1867).
Variant translation: We are convinced that freedom without Socialism is privilege and injustice, and that Socialism without freedom is slavery and brutality.
As quoted in The Political Philosophy of Bakunin: Scientific Anarchism (1953) edited by Grigoriĭ Petrovich Maksimov, p. 269

On The Washington Journal of C-SPAN https://www.c-span.org/video/?124979-1/the-trek-beginning (11 June 1999)
1990s, 1999

1960s, The Rising Tide of Racial Consciousnes (1960)
Context: Injustice anywhere is a threat to justice everywhere. Therefore, no American can afford to be apathetic about the problem of racial justice. It is a problem that meets every man at his front door.

H. Gibb et al., eds., "Mazalim", The Dictionary of Islam vol. IV (Leiden: Brill, 1991)

Essay, written under the pseudonym "Candidus," in The Boston Gazette (14 October 1771), later published in The Life and Public Services of Samuel Adams (1865) by William Vincent Wells, p. 425
Context: The liberties of our Country, the freedom of our civil constitution are worth defending at all hazards: And it is our duty to defend them against all attacks. We have receiv'd them as a fair Inheritance from our worthy Ancestors: They purchas'd them for us with toil and danger and expence of treasure and blood; and transmitted them to us with care and diligence. It will bring an everlasting mark of infamy on the present generation, enlightened as it is, if we should suffer them to be wrested from us by violence without a struggle; or be cheated out of them by the artifices of false and designing men. Of the latter we are in most danger at present: Let us therefore be aware of it. Let us contemplate our forefathers and posterity; and resolve to maintain the rights bequeath'd to us from the former, for the sake of the latter. — Instead of sitting down satisfied with the efforts we have already made, which is the wish of our enemies, the necessity of the times, more than ever, calls for our utmost circumspection, deliberation, fortitude, and perseverance. Let us remember that "if we suffer tamely a lawless attack upon our liberty, we encourage it, and involve others in our doom." It is a very serious consideration, which should deeply impress our minds, that millions yet unborn may be the miserable sharers of the event.

Part II: The Banality of Slavery, page 65.
Going Postal: Rage, Murder, and Rebellion, From Reagan's Workplaces to Clinton's Columbine and Beyond (2005)
Context: Just as the American colonials' consciousness expanded from rebelling against unfair taxation in the 1760s to wide noble revolutionary goals touching on the inherent rights of mankind, so the Whiskey Rebellion guerrillas took on broader themes as injustice increasingly framed their consciousness. Once you start seeing injustice in one place, it's like taking off blinders- you start to see injustice everywhere, and how it is all connected.