Religion is the sigh of the oppressed creature, the heart of a heartless world, just as it is the spirit of a spiritless situation.

Philosophy is to the real world as masturbation is to sex.

Last words are for fools who haven't said enough.

While the miser is merely a capitalist gone mad, the capitalist is a rational miser

All economists share the error of examining surplus-value not as such, in its pure form, but in the particular forms of profit and rent.

Human anatomy contains a key to the anatomy of the ape.

Revolutions are the locomotives of history.

A spectre is haunting Europe – the spectre of communism.

The philosophers have only interpreted the world, in various ways; the point is to change it.

The question whether objective truth can be attributed to human thinking is not a question of theory but is a practical question.