Although in many primitive cultures there is a recognized division of function between priests and shamans, in the more highly developed cultures in which cults have become strongly organized churches, the priesthood fights an unrelenting war against shamans.… Priests work in a rigorously structured hierarchy fixed in a firm set of traditions. Their power comes from and is vested in the organization itself. They constitute a religious bureaucracy. Shamans, on the other hand, are arrant individualists. Each is on his own, undisciplined by bureaucratic control; hence a shaman is always a threat
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