The product of mental labor - science - always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production.

The bourgeoisie of the whole world, which looks complacently upon the wholesale massacre after the battle, is convulsed by horror at the desecration of brick and mortar.

We have no compassion and we ask no compassion from you. When our turn comes, we shall not make excuses for the terror.

Social reforms are never carried out by the weakness of the strong; but always by the strength of the weak.

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

...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.

Reason has always existed, but not always in a reasonable form.