This conception is the one handle by means of which the material of history, as at present expounded, can be dealt with, and anyone who breaks that handle off, as Buckle did, without finding some other method of treating historical material, merely deprives himself of the one possible way of dealing with it. The necessity of the conception of power as an explanation of historical events is best demonstrated by the universal historians and historians of culture themselves, for they professedly reject that conception but inevitably have recourse to it at every step.