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There are three principal means of acquiring knowledge available to us: observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination. Our observation of nature must be diligent, our reflection profound, and our experiments exact. We rarely see these three means combined; and for this reason, creative geniuses are not common.

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A bit about Denis Diderot ...

Denis Diderot (October 5, 1713 July 31, 1784) was a French philosopher and writer. Born in Langres, Champagne, France in 1713, he was a prominent figure in what became known as the Enlightenment, and was the editor-in-chief of the famous Encyclopdie.

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