Nature's due time comes at length, as come it must. Since man must die, he must reproduce himself, so that the species may endure and the order of the world continue. When by the signs I have spoken of you perceive that the critical moment is at hand, at once abandon for ever your former tone. He is still your disciple, but not your scholar. He is a man and your friend; henceforth you must treat him as such. What! Must I abdicate my authority when most I need it? Must I abandon the adult to himself just when he least knows how to control himself, when he may fall into the gravest errors! Must I renounce my rights when it matters most that I should use them on his behalf? Who bids you renounce them; he is only just becoming conscious of them. Hitherto all you have gained has been won by force or guile; authority, the law of duty, were unknown to him, you had to constrain or deceive him to gain his obedience. But see what fresh chains you have bound about his heart. Reason, friendship, affection, gratitude, a thousand bonds of affection, speak to him in a voice he cannot fail to hear. His ears are not yet dulled by vice, he is still sensitive only to the passions of nature. Self-love, the first of these, delivers him into your hands; habit confirms this. If a passing transport tears him from you, regret restores him to you without delay; the sentiment which attaches him to you is the only lasting sentiment, all the rest are fleeting and self-effacing. Do not let him become corrupt, and he will always be docile; he will not begin to rebel till he is already perverted. I grant you, indeed, that if you directly oppose his growing desires and foolishly treat as crimes the fresh needs which are beginning to make themselves felt in him, he will not listen to you for long; but as soon as you abandon my method I cannot be answerable for the consequences. Remember that you are nature's minister; you will never be her foe. But what shall we decide to do? You see no alternative but either to favour his inclinations or to resist them; to tyrannise or to wink at his misconduct; and both of these may lead to such dangerous results that one must indeed hesitate between them. The first way out of the difficulty is a very early marriage; this is undoubtedly the safest and most natural plan. I doubt, however, whether it is the best or the most useful. I will give my reasons later; meanwhile I admit that young men should marry when they reach a marriageable age. But this age comes too soon; we have made them precocious; marriage should be postponed to maturity. If it were merely a case of listening to their wishes and following their lead it would be an easy matter; but there are so many contradictions between the rights of nature and the laws of society that to conciliate them we must continually contradict ourselves. Much art is required to prevent man in society from being altogether artificial.