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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."
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"There is nothing more imprudent than excessive prudence."

"There is nothing either good or bad but thinking makes it so."

"For a moment, nothing happened. Then, after a second or so, nothing continued to happen."

"Nothing is so common-place as to wish to be remarkable."

"The reason this resolution was delayed had nothing to do with anything Karl did or failed to do."
Explore more quotes by Jean Piaget


"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."


"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."


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


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


"The first type of abstraction from objects I shall refer to as simple abstraction, but the second type I shall call reflective abstraction, using this term in a double sense."


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


"Scientific knowledge is in perpetual evolution; it finds itself changed from one day to the next."


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


"Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality."
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