"A person cannot conceive the variable distance between himself and objects of his universe in any precise and law-related manner without concretely and gradually elaborating upon these properties by the definition of the level of his thought."
"The principal goal of education in the schools should be creating men and women who are capable of doing new things, not simply repeating what other generations have done."
"Play is the work of childhood."
"Intelligence is what you use when you don't know what to do."
"The child doesn't grow into the adult; but the adult is the child, elaborated."