During the earliest stages the child perceives things like a solipsist who is unaware of himself as subject and is familiar only with his own actions.
Jean Piaget
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Our problem, from the point of view of psychology and from the point of view of genetic epistemology, is to explain how the transition is made from a lower level of knowledge to a level that is judged to be higher.
- Jean Piaget -
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Logical positivists have never taken psychology into account in their epistemology, but they affirm that logical beings and mathematical beings are nothing but linguistic structures.
- Jean Piaget -