The whole art of teaching is only the art of awakening the natural curiosity of young minds for the purpose of satisfying it afterwards; and curiosity itself can be vivid and wholesome only in proportion as the mind is contented and happy.
 Anatole France, The Crime of Sylvestre Bonnard (1881). copy citation

Context

“The notary then took it upon himself to justify Mademoiselle Prefere’s educational system, and observed by way of conclusion, “It is not by amusing oneself that one can learn.” “It is only by amusing oneself that one can learn,” I replied. “The whole art of teaching is only the art of awakening the natural curiosity of young minds for the purpose of satisfying it afterwards; and curiosity itself can be vivid and wholesome only in proportion as the mind is contented and happy. Those acquirements crammed by force into the minds of children simply clog and stifle intelligence. In order that knowledge be properly digested, it must have been swallowed with a good appetite. I know Jeanne!” source