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.

Labour is ... not the only source of material wealth, i.e, of the use-values it produces. As William Petty says, Labour is the father of material wealth, the earth is its mother.

The fact that labour is external to the worker, i.e., it does not belong to his intrinsic nature; that in his work, therefore he does not affirm himself but denies himself, does not feel content but unhappy, does not develop freely his physical and mental energy but mortifies his body and his mind. The worker therefore only feels himself outside his work, and in his work feels outside himself.

Labor in the white skin can never free itself as long as labor in the black skin is branded.

The unity of the bourgeoisie can be shaken only by the unity of the proletariat.

When the sufferers learn to think, then the thinkers will learn to suffer.

All history is nothing but a continuous transformation of human nature.