There are no circumstances imaginable, not even victory, under which the proletariat should give up its possession of arms.

The state is the executive committee of the ruling class.

In a word, the free trade system hastens the social revolution. It is in this revolutionary sense alone, gentlemen, that I vote in favor of free trade.

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

It is not the consciousness of men that determines their being, but, on the contrary, their social being that determines their consciousness.

Perseus wore a magic cap that the monsters he hunted down might not see him. We draw the magic cap down over eyes and ears as a make-believe that there are no monsters.

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