Scientific knowledge is in perpetual evolution

By: Jean Piaget

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I have always detested any departure from reality, an attitude which I relate to my mother's poor mental health... view

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This means that no single logic is strong enough to support the total construction of human knowledge... view

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It is with children that we have the best chance of studying the development of logical knowledge, mathematical knowledge, physical knowledge, and so forth... view

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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... view

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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... view

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In genetic epistemology, as in developmental psychology, too, there is never an absolute beginning... view

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The self thus becomes aware of itself, at least in its practical action, and discovers itself as a cause among other causes and as an object subject to the same laws as other objects... view

By: Jean Piaget

Reflective abstraction, however, is based not on individual actions but on coordinated actions... view

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The current state of knowledge is a moment in history, changing just as rapidly as the state of knowledge in the past has ever changed and, in many instances, more rapidly... view

By: Jean Piaget

From this time on, the universe is built up into an aggregate of permanent objects connected by causal relations that are independent of the subject and are placed in objective space and time... view

By: Jean Piaget

In other words, knowledge of the external world begins with an immediate utilisation of things, whereas knowledge of self is stopped by this purely practical and utilitarian contact... view

By: Jean Piaget