Modern bourgeois society with its relations of production, of exchange, and of property, a society that has conjured up such gigantic means of production and of exchange, is like the sorcerer, who is no longer able to control the powers of the nether world whom he has called up by his spells.

Moments are the elements of profit

Communism is for us not a state of affairs which is to be established, an ideal to which reality [will] have to adjust itself. We call communism the real movement which abolishes the present state of things. The conditions of this movement result from the premises now in existence.

The philosophers have only interpreted the world, in various ways. The point, however, is to change it.[These words are also inscribed upon his grave]

As individuals express their life, so they are.

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