"There are in fact four very significant stumbling blocks 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."

Source : "Teaching the pursuit of science". Book by John H. Woodburn and Ellsworth Scott Obourn, p. 70, 1965.

Roger Bacon

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