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
"The world is full of errors, and men are in darkness, and they do not know it."
"The greatest impediment to learning is the fear of error."
"The true wisdom is not to be found in the books of the Latins, but in the books of the Greeks and Arabs."
"Many things are held to be true which are false, and many things are held to be false which are true."
"Without experiment, nothing can be sufficiently known."
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