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

 

Ambrose Bierce

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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.

 

Denis Diderot

 

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

 

My observation continues to confirm me more and more in the opinion, that to experience religion is to experience the truth of the great doctrines of Divine grace.

 

Ichabod Spencer

 

Direct experience is the evasion, or hiding place of those devoid of imagination.

 

Fernando Pessoa

 

The restoration of our world-view can come only as a result of inexorably truth-loving and recklessly courageous thought. Such thinking alone is mature enough to learn by experience how the rational, when it thinks itself out to a conclusion, passes necessarily over into the non-rational. World- and life-affirmation and ethics are non-rational. They are not justified by any corresponding knowledge of the nature of the world, but are the disposition in which, through the inner compulsion of our will-to-live, we determine our relation to the world.
What the activity of this disposition of ours means in the evolution of the world, we do not know. Nor can we regulate this activity from outside; we must leave entirely to each individual its shaping and its extension. From every point of view, then, world- and life-affirmation and ethics are non-rational, and we must have the courage to admit it.

 

Albert Schweitzer