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.
Jean Piaget
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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.
- Jean Piaget -
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To express the same idea in still another way, I think that human knowledge is essentially active.
- Jean Piaget