All through the physical world runs an unknown content, which must really be the stuff of our consciousness … We have found a strange footprint on the shores of the unknown. We have devised profound theories, one after another, to account for its origin. At last we have succeeded in reconstructing the creature that made the footprint. And lo! it is our own.—Eddington, Space, Time, and Gravitation.The most significant aspect of the intellectual attitude of the twentieth century appears to be the fulfillment of Nietzsche's prophecy that the last achievement of the Occidental intellect will be to question all its achievements and, in the end, to doubt its own existence. Philosophers and logicians, as well as physicists, seem to have arrived at a state of extreme resignation, while those psychologists who can be called scientists have at least their moments of scepticism. It is hardly necessary to refer to Spenglerian pessimism, to what H. Leisegang writes about the crisis and catastrophe of logic, or to Einstein's views, as expressed, for example, in his speech given in honor of Planck in 1918, in which he pointed out the current tendency to seek a simplified synoptic view of the world—a picture comfortable to human nature—and to overcome the world by replacing it with this picture. How little psychology has as yet revealed, or can ever hope to reveal, can be gleaned from C. K. Ogden's enlightening account in The Meaning of Psychology.
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