Anyone who knows anything of history knows that great social changes are impossible without feminine upheaval. Social progress can be measured exactly by the social position of the fair sex, the ugly ones included.

...the French Revolution gave rise to ideas which led beyond the ideas of the entire old world order. The revolutionary movement which began in 1789... gave rise to the communist idea which Babeuf's friend Buonarroti re-introduced in France after the Revolution of 1830. This idea, consistently developed, is the idea of the new world order.

The whole proletariat must be armed at once with muskets, rifles, cannon and ammunition, and the revival of the old-style citizens militia, directed against the workers, must be opposed.

In proportion as capital accumulates, the lot of the laborer, be his payment high or low, must grow worse.

The task is not just to understand the world but to change it.

The English have all the material requisites for the revolution. What they lack is the spirit of generalization and revolutionary ardour.

Revolutions are the locomotives of history.