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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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No. 15

 

Denis Diderot

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The young man [Turgot] destined for an ecclesiastical career was placed within walls carefully designed to keep out all currents of new thought; his studies, his reading, his professors, his associates, all were combined to keep from him any results of observation or reflection save those prescribed: probably, of all means for stifling healthy and helpful thought, a theological seminary, as then conducted—whether Catholic or Protestant, Jewish or Mohammedan, was the most perfect.

 

Andrew Dickson White

 

Rational, adj. Devoid of all delusions save those of observation, experience and reflection.

 

Ambrose Bierce

 

Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory. On the other hand, you can disprove a theory by finding even a single observation that disagrees with the predictions of the theory. As philosopher of science Karl Popper has emphasized, a good theory is characterized by the fact that it makes a number of predictions that could in principle be disproved or falsified by observation. Each time new experiments are observed to agree with the predictions the theory survives, and our confidence in it is increased; but if ever a new observation is found to disagree, we have to abandon or modify the theory.

 

Stephen Hawking

 

No former age was ever in such a favorable position with regard to the sources of our knowledge of human nature. Psychology, ethnology, anthropology, and history have amassed an astonishingly rich and constantly increasing body of facts. Our technical instruments for observation and experimentation have been immensely improved, and our analyses have become sharper and more penetrating. We appear, nevertheless, not yet to have found a method for the mastery and organization of this material.... Unless we succeed in finding a clue of Ariadne to lead us out of this labyrinth, we can have no real insight into the general character of human culture; we shall remain lost in a mass of disconnected and disintegrated data which seem to lack all conceptual unity.

 

Ernst Cassirer

 

"Reflection upon situationality is reflection about the very condition of existence: critical thinking by means which people discover each other to be 'in a situation.'"

 

Paulo Freire