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"This means that no single logic is strong enough to support the total construction of human knowledge."
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"There is only a perspective seeing, only a perspective "knowing"; and the more affects we allow to speak about one thing, the more eyes, different eyes, we can use to observe one thing, the more complete will our "concept" of this thing, our "objectivity," be."

"Knowledge is invariably a matter of degree: you cannot put your finger upon even the simplest datum and say this we know."

"One of the most important gifts that you can give to yourself is the gift of self-education, that is the best way to grow on constant basis."

"Understand the concept of time and find ways to maximize it effectively."

"Why must ignorance be destroyed? Because it is the number one destroyer of the people of God."

"Oh, my dear Vimes, history changes all the time. It is constantly being re-examined and re-evaluated, otherwise how would we be able to keep historians occupied? We can't possibly allow people with their sort of minds to walk around with time on their hands."
Explore more quotes by Jean Piaget


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


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


"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."


"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."


"On the one hand, there are individual actions such as throwing, pushing, touching, rubbing. It is these individual actions that give rise most of the time to abstraction from objects."


"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."


"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."


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