“While taking the "best of early Chinese and Cuban socialism" -- which one assumes would exclude the forced abortions, imprisonment for homosexuals and forced labor”

Gerd Gigerenzer and Reinhard Selten (2001), Bounded Rationality. The Adaptive Toolbox, Cambridge, Massachusetts.

“Changes of Attitude and Rhetoric in Auden’s Poetry”, pp. 127–128
The Third Book of Criticism (1969)

"In the Storm" in Le Socialiste http://www.marxists.org/archive/luxemburg/1904/05/01.htm as translated by Mitch Abidor (1 - 8 May 1904)
Context: The Russo-Japanese War now gives to all an awareness that even war and peace in Europe – its destiny – isn’t decided between the four walls of the European concert, but outside it, in the gigantic maelstrom of world and colonial politics.
And its in this that the real meaning of the current war resides for social-democracy, even if we set aside its immediate effect: the collapse of Russian absolutism. This war brings the gaze of the international proletariat back to the great political and economic connectedness of the world, and violently dissipates in our ranks the particularism, the pettiness of ideas that form in any period of political calm.
The war completely rends all the veils which the bourgeois world – this world of economic, political and social fetishism – constantly wraps us in.
The war destroys the appearance which leads us to believe in peaceful social evolution; in the omnipotence and the untouchability of bourgeois legality; in national exclusivism; in the stability of political conditions; in the conscious direction of politics by these “statesmen” or parties; in the significance capable of shaking up the world of the squabbles in bourgeois parliaments; in parliamentarism as the so-called center of social existence.
War unleashes – at the same time as the reactionary forces of the capitalist world – the generating forces of social revolution which ferment in its depths.

Source: Irrational Man: A Study in Existential Philosophy (1958), Chapter Ten, Sartre, p. 224

"Morality and Birth Control", February-March, 1918, pp. 11,14.
Birth Control Review, 1918-32

Playboy interview (May 1995)
Context: My point is that you cannot force social change at a speed that it cannot go. Social change is evolutionary, not revolutionary. Deep social change takes time. And slowly the culture is changing. The MTV generation is far more tolerant, and that tolerance is growing.

Quoted in "Korea would Try 2 Japanese Chiefs" from "New York Times" article - November 30, 1948.

The trial of Charles B. Reynolds for blasphemy (1887)
Context: the defendant had the right to say every word with which he is charged in this indictment. He had the right to give his honest thought, no matter whether any human being agreed with what he said or not, and no matter whether any other man approved of the manner in which he said these things. I defend his right to speak, whether I believe in what he spoke or not, or in the propriety of saying what he did. I should defend a man just as cheerfully who had spoken against my doctrine, as one who had spoken against the popular superstitions of my time. It would make no difference to me how unjust the attack was upon my belief -- how maliciously ingenious; and no matter how sacred the conviction that was attacked, I would defend the freedom of speech. And why? Because no attack can be answered by force, no argument can be refuted by a blow, or by imprisonment, or by fine. You may imprison the man, but the argument is free; you may fell the man to the earth, but the statement stands.