Roger Bacon — "There are four chief obstacles to grasping truth: authority, habit, popular opin…"
There are four chief obstacles to grasping truth: authority, habit, popular opinion, and the concealment of ignorance.
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More from Roger Bacon
"He who knows not mathematics cannot know any other sciences."
"Theology itself, which is the queen of the sciences, cannot be perfect without philosophy."
"The study of astrology is necessary for medicine, and for the understanding of the future."
"The study of music, as it is commonly taught, is of little utility."
"For the infidels possess many excellent things, and much wisdom, from which we Christians can derive profit."
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