"Everything changes and nothing remains still... you cannot step twice into the same stream."
"For the things we have to learn before we can do them, we learn by doing them."
"Knowledge is the product of the interaction between an individual and the environment, understanding such as something social and cultural, not just physical."
"The goal of education is not to increase the amount of knowledge but to create the possibilities for a child to invent and discover, to create men who are capable of doing new things."
"Bodily exercise, when compulsory, does no harm to the body; but knowledge which is acquired under compulsion obtains no hold on the mind."