Quote by Denis Diderot
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.
Summary
This quote emphasizes the three main methods through which knowledge is acquired: observation, reflection, and experimentation. Observation involves gathering facts, reflection involves analyzing and combining these facts, and experimentation involves testing and validating the combination. The quote suggests that the combination of these three means is rare, resulting in a scarcity of creative geniuses. It encourages diligence in observing nature, depth in reflecting upon collected information, and precision in conducting experiments to unlock new knowledge.