Therefore we must, at the start, clear our minds, so far as we can, of all preconceptions, prejudices, assumptions, and theories; we must turn away even from Plato and Aristotle; we must sweep out of our thought the “idols,” or time-honored illusions and fallacies, born of our personal idiosyncrasies of judgment or the traditional beliefs and dogmas of our group; we must banish all logical tricks of wishful thinking, all verbal absurdities of obscure thought. We must put behind us all those majestic deductive systems of philosophy which proposed to draw a thousand eternal verities out of a few
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