"Let the ruling classes tremble at a Communistic revolution. The proletarians have nothing to lose but their chains. They have a world to win. Working men of all countries, unite!"

"Greek philosophy seems to have met with something with which a good tragedy is not supposed to meet, namely, a dull ending."

"The bourgeoisie cannot exist without constantly revolutionising the instruments of production, and thereby the relations of production, and with them the whole relations of society."

"The product of labour is alienated from the worker; it becomes an alien object, a power independent of the producer."

"Necessity is blind until it becomes conscious. Freedom is the consciousness of necessity."