The only conception that can explain the movement of the peoples is that of some force commensurate with the whole movement of the peoples.

Yet to supply this conception various historians take forces of different kinds, all of which are incommensurate with the movement observed. Some see it as a force directly inherent in heroes, as the peasant sees the devil in the locomotive; others as a force resulting from several other forces, like the movement of the wheels; others again as an intellectual influence, like the smoke that is blown away.

So long as histories are written of separate individuals, whether Caesars, Alexanders, Luthers, or Voltaires, and not the histories of all , absolutely all those who take part in an event, it is quite impossible to describe the movement of humanity without the conception of a force compelling men to direct their activity toward a certain end. And the only such conception known to historians is that of power.