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For if any man who never saw fire proved by satisfactory arguments that fire burns. His hearer's mind would never be satisfied, nor would he avoid the fire until he put his hand in it that he might learn by experiment what argument taught.

Roger Bacon

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Roger Bacon
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More quotes by Roger Bacon

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But we must here state that we should not see anything if there were a vacuum. But this would not be due to some nature hindering species, and resisting it, but because of the lack of a nature suitable for the multiplication of species for species is a natural thing, and therefore needs a natural medium but in a vacuum nature does not exist.
Roger Bacon
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A man is crazy who writes a secret in any other way than one which will conceal it from the vulgar.
Roger Bacon
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There are two modes of knowledge: through argument and through experience. Argument brings conclusions and compels us to concede them, but it does not cause certainty nor remove doubts that the mind may rest in truth, unless this is provided by experience.
Roger Bacon
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Atheists are like wild feral dogs wih no master. But Christians are like loving dogs with a giving and loving master. Domesticated dogs will love you always, but Feral wild dogs HAVE to be put down. they are a danger to us all.
Roger Bacon
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For the things of this world cannot be made known without a knowledge of mathematics.
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[I]f in other sciences we should arrive at certainty without doubt and truth without error, it behooves us to place the foundations of knowledge in mathematics, in so far as disposed through it we are able to reach certainty in other sciences and truth by the exclusion of error.
Roger Bacon
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One man alone had really known the sciences, namely, Robert, Bishop of Lincoln.
Roger Bacon
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There are two modes of acquiring knowledge, namely by reasoning and experience. Reasoning draws a conclusion and makes us grant the conclusion, but does not make the conclusion certain, nor does it remove doubt so that the mind may rest on the intuition of truth, unless the mind discovers it by the path of experience.
Roger Bacon
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The calendar is intolerable to all wisdom, the horror of all astronomy, and a laughing stock from a mathematician's point of view.
Roger Bacon
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The conquest of learning is achieved through the knowledge of languages.
Roger Bacon
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A little learning is a dangerous thing but none at all is fatal.
Roger Bacon
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Mathematics is the gate and key to science.
Roger Bacon
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... mathematics is absolutely necessary and useful to the other sciences.
Roger Bacon
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Argument is conclusive, but it does not remove doubt.
Roger Bacon
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It is easier for a man to burn down his own house than to get rid of his prejudices.
Roger Bacon
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To ask the proper question is half of knowing.
Roger Bacon
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All science requires mathematics. [Editors' summary of Bacon's idea, not Bacon's wording.]
Roger Bacon
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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.
Roger Bacon
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It is not necessarily impossible for human beings to fly, but it so happens that God did not give them the knowledge of how to do it. It follows, therefore, that anyone who claims that he can fly must have sought the aid of the devil. To attempt to fly is therefore sinful.
Roger Bacon
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Cease to be ruled by dogmas and authorities look at the world!
Roger Bacon