“To express the same idea in still another way, I think that human knowledge is essentially active.”
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This means that no single logic is strong enough to support the total construction of human knowledge.
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.
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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.
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