This means that no single logic is strong enough to support the total construction of human knowledge. – Jean Piaget
It is with children that we have the best chance of studying the development of logical knowledge, mathematical knowledge, physical knowledge, and so forth. – Jean Piaget
To express the same idea in still another way, I think that human knowledge is essentially active. – Jean Piaget
Our problem, from the point of view of psychology and from the point of view of genetic epistemology, is to explain how the transition is made from a lower level of knowledge to a level that is judged to be higher. – Jean Piaget