The weapon of criticism can never replace the criticism of weapons.

Machines were, it may be said, the weapon employed by the capitalists to quell the revolt of specialized labor.

All science would be superfluous if the outward appearance and the essence of things directly coincided.

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

Modern society, which, soon after its birth, pulled Plutus by the hair of his head from the bowels of the earth, greets gold as its Holy Grail, as the glittering incarnation of the very principle of its own life.

We should not say that one man's hour is worth another man's hour, but rather that one man during an hour is worth just as much as another man during an hour. Time is everything, man is nothing: he is at the most time's carcass.

There is no greater stupidity than for people...to marry and so surrender themselves to the small miseries of domestic and private life.