Roger Bacon

“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.”

– Roger Bacon
Source: Opus Majus, 1266-67

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