Communism is the riddle of history solved, and it knows itself to be this solution.

The history of all hitherto existing society is the history of class struggles.

Freeman and slave, patrician and plebeian, lord and serf, guildmaster and journeyman, in a word, oppressor and oppressed, stood in constant opposition to one another, carried on an uninterrupted, now hidden, now open fight, that each time ended, either in the revolutionary reconstitution of society at large, or in the common ruin of the contending classes.

Everyone who knows anything of history also knows that great social revolutions are impossible without the feminine ferment. Social progress may be measured precisely by the social position of the fair sex (plain ones included).

The theory of Communism may be summed up in one sentence: Abolish all private property

Philosophers have hitherto only interpreted the world in various ways; the point is to change it

There is a specter haunting Europe, the specter of Communism.