"The bourgeoisie has stripped of its halo every occupation hitherto honoured and looked up to with reverent awe. It has converted the physician, the lawyer, the priest, the poet, the man of science, in…"

"The proletarians have nothing to lose but their chains. They have a world to win. Workingmen of all countries, unite!"

"Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people."

"I am humorous, but the law bids me write seriously. I am audacious, but the law commands that my style be modest."

"A spectre is haunting Europe – the spectre of communism."