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“The history of all hitherto existing society is the history of class struggles.

Freeman and slave, patrician and plebeian, lord and serf, guildmaster and journeyman, in a word, oppressor and oppressed, stood in constant opposition to one another, carried on an uninterrupted, now hidden, now open fight, that each time ended, either in the revolutionary reconstitution of society at large, or in the common ruin of the contending classes.”
― Karl Marx, The Communist Manifesto

“There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.”
― Charles Darwin, The Origin of Species

“The only thing that makes life possible is permanent, intolerable uncertainty: not knowing what comes next.”
― Ursula K. Le Guin, The Left Hand of Darkness

“Everything can be explained to the people, on the single condition that you want them to understand.”
― Frantz Fanon, The Wretched of the Earth