"watch carefully over the young man; he can protect himself from all other foes, but it is for you to protect him against himself. Never leave him night or day, or at least share his room; never let him go to bed till he is sleepy, and let him rise as soon as he wakes. Distrust instinct as soon as you cease to rely altogether upon it. Instinct was good while he acted under its guidance only; now that he is in the midst of human institutions, instinct is not to be trusted; it must not be destroyed, it must be controlled, which is perhaps a more difficult matter. It would be a dangerous matter if instinct taught your pupil to abuse his senses; if once he acquires this dangerous habit he is ruined. From that time forward, body and soul will be enervated; he will carry to the grave the sad effects of this habit, the most fatal habit which a young man can acquire. If you cannot attain to the mastery of your passions, dear Emile, I pity you; but I shall not hesitate for a moment, I will not permit the purposes of nature to be evaded. If you must be a slave, I prefer to surrender you to a tyrant from whom I may deliver you; whatever happens, I can free you more easily from the slavery of women than from yourself."