Religious distress is at the same time the expression of the real distress and also the protest against real distress. Religion is the sigh of the oppressed creature, the heart of a heartless world, just as it is the spirit of the spiritless condition. It is the opium of the people.

The proletarians have nothing to loose but their chains. They have a world to win.

A man cannot become a child again, or he becomes childish.

Capitalist production, therefore, develops technology, and the combining together of various processes into a social whole, only by sapping the original sources of all wealth - the soil and the labourer.

The true law of economics is chance, and we learned people arbitrarily seize on a few moments and establish them as laws.

...the Communists everywhere support every revolutionary movement against the existing social and political order of things... They openly declare that their ends can be attained only by the forcible overthrow of all existing social conditions.

Wages are determined by the bitter struggle between capitalist and worker.