"Men who allow their love of power to give them a distorted view of the world are to be found in every asylum: one man will think he is the Governor of the Bank of England, another will think he is the King, and yet another will think he is God. Highly similar delusions, if expressed by educated men in obscure language, lead to professorships of philosophy; and if expressed by emotional men in eloquent language, lead to dictatorships."

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...By a 'silly' theory I mean one which may be held at the time when one is talking or writing professionally, but which only an inmate of a lunatic asylum would think of carrying into daily life. ... It must not be supposed that the men who maintain these theories and beliefs are 'silly' people. Only very acute and learned men could have thought of anything so odd or defended anything so preposterous against the continual protests of common sense.

— C. D. Broad