"There are in fact four very significant stumblingblocks in the way
of grasping the truth, which hinder every man however learned,
and scarcely allow anyone to win a clear title to wisdom, namely,
the example of weak and unworthy authority, longstanding custom,
the feeling of the ignorant crowd, and the hiding of our own ignorance
while making a display of our apparent knowledge."
Opus Majus, 1266-67
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