"Knowledge of languages is the doorway to wisdom."
"Vacuum stands and remains a mathematical space. A cube placed in a vacuum would not displace anything, as it would displace air or water in a space already containing those fluids."
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Source: 1267 OpusMajus, pt.4, ch.1 (translated by Robert Belle Burke, 1928).
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More quotes by Roger Bacon
"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."