Quotation by Isaac Newton

I frame no hypotheses; for whatever is not deduced from the phenomena is to be called a hypothesis; and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy.
Isaac Newton (1642–1727), British physicist, mathematician, universal genius. Letter to Robert Hooke, February 5, 1675.

A famous bon mot strangely ill describing what would appear to have been its author's actual practice.
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