"The Christians were the first to make the existence of Satan a dogma of the Church. And once that she had established it, she had to struggle for over 1,700 years for the repression of a mysterious force which it was her policy to make appear of diabolical origin... If modern "spirits" are devils at all, as preached by the clergy, then they can only be those "poor" or "stupid devils" whom Max Muller describes as appearing so often in the German and Norwegian tales."