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WRITERS A-H > editor, philosopher > Denis Diderot

There are three...

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There are three principal means of acquiring knowledge . . . observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.

Source: On the Interpretation of Nature, 1753.
-- Denis Diderot, (Oct 5 1713-1784), French editor, philosopher; He edited the first modern Encyclopedia, 1745.

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