"Knowledge of languages is the doorway to wisdom."
"There are four great sciences, without which the other sciences cannot be known nor a knowledge of things secured ... Of these sciences the gate and key is mathematics ... He who is ignorant of this [mathematics] cannot know the other sciences nor the affairs of this world."
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Source: Roger Bacon (1928). “The Opus majus of Roger Bacon: a translation of Robert Belle Burke”
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"Reasoning draws a conclusion, but does not make the conclusion certain, unless the mind discovers it by the path of experience."
"There are four chief obstacles in grasping truth ... namely, submission to faulty and unworthy authority, influence of custom, popular prejudice, and the concealment of our own ignorance accompanied by an ostentatious display of our knowledge."
"Cease to be ruled by dogmas and authorities; look at the world!"
"It is easier for a man to burn down his own house than to get rid of his prejudices."
"The strongest arguments prove nothing so long as the conclusions are not verified by experience. Experimental science is the queen of sciences and the goal of all speculation."