minutely examining various religious, philosophic, and political doctrines as causes of events, as soon as they have to describe an actual historic event such as the campaign of 1812 for instance, they involuntarily describe it as resulting from an exercise of power—and say plainly that that was the result of Napoleon’s will. Speaking so, the historians of culture involuntarily contradict themselves, and show that the new force they have devised does not account for what happens in history, and that history can only be explained by introducing a power which they apparently do not recognize.
III
A locomotive is moving. Someone asks: “What moves it?” A peasant says the devil moves it. Another man says the locomotive moves because its wheels go round. A third asserts that the cause of its movement lies in the smoke which the wind carries away.
The peasant is irrefutable. He has devised a complete explanation. To refute him someone would have to prove to him that there is no devil, or another peasant would have to explain to him that it is not the devil but a German, who moves the locomotive. Only then, as a result of the contradiction, will they see that they are both wrong. But the man who says that the movement of the wheels is the cause refutes himself, for having once begun to analyze he ought to go on and explain further why the wheels go round; and till he has reached the ultimate cause of the movement of the locomotive in the pressure of steam in the boiler, he has no right to stop in his search for the cause. The man who explains the movement of the locomotive by the smoke that is carried back has noticed that the wheels do not supply an explanation and has taken the first sign that occurs to him and in his turn has offered that as an explanation.
The only conception that can explain the movement of the locomotive is that of a force commensurate with the movement observed.