QUOTE : In Emile the child was to be kept from books-except one, Robinson Crusoe, which Rousseau called "the happiest treatise of natural education." "Children begin by being helped, end by being served," he warned. They become masters, using their tears as prayers. The teacher must guide without seeming to, must never use corporal punishment, but must provide situations in which the child can learn for himself. The teacher, too, must know the stages of a child's development and introduce subjects only when the child is emotionally prepared. At the age of twelve the pupil must learn a useful trade. "Emile must work like a peasant and think like a philosopher in order not to be as lazy as a savage." Not until the age of eighteen should Emile turn to moral science and religion, and then he can choose his religion. For "at an age when all is mystery there can be no mysteries properly speaking." The child must have compassion, "love those who have it, but fly from the pious believers." But also shun the philosophers ("angry wolves"), who are "ardent missionaries of atheism and very imperious dogmatics who will not endure without fury that one might think differently from them.