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Rh and the like. Generally when we write about culture, tradition, and the group mind, we are thinking of these systems perfected by men of genius. Now there is no disputing the necessity of constant study and criticism of these idealized versions, but the historian of people, the politician, and the publicity man cannot stop there. For what operates in history is not the systematic idea as a genius formulated it, but shifting imitations, replicas, counterfeits, analogies, and distortions in individual minds.

Thus Marxism is not necessarily what Karl Marx wrote in Das Kapital, but whatever it is that all the warring sects believe, who claim to be the faithful. From the gospels you cannot deduce the history of Christianity, nor from the Constitution the political history of America. It is Das Kapital as conceived, the gospels as preached and the preachment as understood, the Constitution as interpreted and administered, to which you have to go. For while there is a reciprocating influence between the standard version and the current versions, it is these current versions as distributed among men which affect their behavior.