The history of all previous societies has been the history of class struggles.

Revolutions are the locomotives of history.

The writer may very well serve a movement of history as its mouthpiece, but he cannot of course create it.

History does nothing it does not possess immense riches, it does not fight battles. It is men, real, living, who do all this.

It is not history which uses men as a means of achieving - as if it were an individual person - its own ends. History is nothing but the activity of men in pursuit of their ends.