“Wisdom is not a product of schooling but of the lifelong attempt to acquire it.”

“Common sense is the collection of prejudices acquired by age eighteen.”

“Combinatory play seems to be the essential feature in productive thought.”

“Only those who attempt the absurd can achieve the impossible.”

“I never teach my pupils, I only attempt to provide the conditions in which they can learn.”

“The word 'God' is for me nothing more than the expression and product of human weaknesses, the Bible a collection of honorable, but still primitive legends which are nevertheless pretty childish. No interpretation, no matter how subtle, can (for me) change this.”

“A society's competitive advantage will come not from how well its schools teach the multiplication and periodic tables, but from how well they stimulate imagination and creativity.”