Karl Marx — "The only antidote to mental suffering is physical pain."

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

"The more the division of labour and the application of machinery extend, the more does the competition among the workers extend, and the more do their wages shrink."

"The advance of capitalist production develops a working class, which by education, tradition, and habit, looks upon the requirements of that mode of production as self-evident natural laws."

"It is a bad thing to perform menial duties even for the sake of freedom; to fight with pinpricks, instead of with clubs. I have become tired of hypocrisy, stupidity, gross arbitrariness, and of our bo…"

"Machinery is designed for the purpose of saving labour, but it does not save the working class from the necessity of working."