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Our mind is so fortunately equipped, that it brings us the most important bases for our thoughts without our having the least knowledge of this work of elaboration. Only the results of it become unconscious.
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From the standpoint of observation, then, we must regard it as a highly probable hypothesis that the beginnings of the mental life date from as far back as the beginnings of life at large.
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The distinguishing characteristics of mind are of a subjective sort; we know them only from the contents of our own consciousness.
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The old metaphysical prejudice that man 'always thinks' has not yet entirely disappeared. I am myself inclined to hold that man really thinks very little and very seldom.
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The task of physiological psychology remains the same in the analysis of ideas that it was in the investigation of sensations: to act as mediator between the neighbouring sciences of physiology and psychology.
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The results of ethnic psychology constitute, at the same time, our chief source of information regarding the general psychology of the complex mental processes.
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Physiology and psychology cover, between them, the field of vital phenomena; they deal with the facts of life at large, and in particular with the facts of human life.
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The materialistic point of view in psychology can claim, at best, only the value of an heuristic hypothesis.
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Psychology must not only strive to become a useful basis for the other mental sciences, but it must also turn again and again to the historical sciences, in order to obtain an understanding for the more highly developed metal processes.
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We speak of virtue, honour, reason; but our thought does not translate any one of these concepts into a substance.