Roger Bacon — "Theories are of no use if they cannot be tested by experiment."
Theories are of no use if they cannot be tested by experiment.
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More from Roger Bacon
"There are four chief obstacles to grasping truth: frail authority, custom, the opinion of the unlearned crowd, and the concealment of ignorance by ostentation."
"The philosophers of the Arabs are more accurate and more subtle than the Latins."
"The whole world is full of ignorance, and men are content to live in darkness."
"Experimental science is the mistress of all speculative sciences."
"Many things are believed on mere custom, without any reason or proof."
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