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Definitions are temporary verbalizations of concepts, and concepts- particularly difficult concepts- are usually revised repeatedly as our knowledge and understanding grows.
— Ernst Mayr
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Psychoanalysis has changed American psychology from a diagnostic to a therapeutic science, not because so many patients are cured by the psychoanalytic technique, but because of the new understanding of psychiatric patients it has given us, and the new and different concept of illness and health.
— Karl A. Menninger
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