They don't know it, but they are doing it.
Philosophy studies the world, but the point is to change it.
Workers of the world unite; you have nothing to lose but your chains.
But the more these conscious illusions of the ruling class are shown to be false and the less they satisfy common sense, the more dogmatically they are asserted and the more deceitful, moralizing and spiritual becomes the language of established society.
Necessity is blind until it becomes conscious. Freedom is the consciousness of necessity.
The history of all previous societies has been the history of class struggles.