The present state of development of psychology does not allow us to establish those rigorous causal connections which we expect of a science. It is only in the realm of the psychophysiological instincts and reflexes that we can confidently operate with the idea of causality. From the point where psychic life begins—that is, at a level of greater complexity—the psychologist must content himself with more or less widely ranging descriptions of happenings and with the vivid portrayal of the warp and weft of the mind in all its amazing intricacy. In doing this, he must refrain from designating any
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