Then the world will be for the common people, and the sounds of happiness will reach the deepest springs. Ah! Come! People of every land, how can you not be roused.
Nothing can have value without being an object of utility.
The ruling ideas of each age have ever been the ideas of its ruling class.
Revolutions are the locomotives of history.
The production of too many useful things results in too many useless people.
The history of all previous societies has been the history of class struggles.