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" "I am convinced that there is no sort of boundary between the living and the mental or between the biological and the psychological. From the moment an organism takes account of a previous experience and adapts to a new situation, that very much resembles psychology.
Jean Piaget (9 August 1896 – 16 September 1980) was a Swiss developmental psychologist, famous for his work with children and his theory of cognitive development.
Biography information from Wikiquote
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In fact, objects are known only through the subject, while the subject can know himself or her- self only by acting on objects materially and mentally. Indeed, if objects are innumerable and science indefinitely diverse, all knowledge of the subject brings us back to psychology, the science of the subject and the subject's actions.