“There is, I am sensible, an age at which every individual of you would choose to stop; and you will look out for the age at which, had you your wish, your species had stopped. Uneasy at your present condition for reasons which threaten your unhappy posterity with still greater uneasiness, you will perhaps wish it were in your power to go back; and this sentiment ought to be considered, as the panegyric of your first parents, the condemnation of you contemporaries, and a source of terror to all those who may have the misfortune of succeeding you.”

“Those who read this will not fail to laugh at my gallantries, and remark, that after very promising preliminaries, my most forward adventures concluded by a kiss of the hand: yet be not mistaken, reader, in your estimate of my enjoyments; I have, perhaps, tasted more real pleasure in my amours, which concluded by a kiss of the hand, than you will ever have in yours, which, at least, begin there.”

“The word ‘slavery’ and ‘right’ are contradictory, they cancel each other out. Whether as between one man and another, or between one man and a whole people, it would always be absurd to say: "I hereby make a covenant with you which is wholly at your expense and wholly to my advantage; I will respect it so long as I please and you shall respect it as long as I wish.”

“Hold childhood in reverence, and do not be in any hurry to judge it for good or ill. Leave exceptional cases to show themselves, let their qualities be tested and confirmed, before special methods are adopted. Give nature time to work before you take over her business, lest you interfere with her dealings. You assert that you know the value of time and are afraid to waste it. You fail to perceive that it is a greater waste of time to use it ill than to do nothing, and that a child ill taught is further from virtue than a child who has learnt nothing at all. You are afraid to see him spending his early years doing nothing. What! is it nothing to be happy, nothing to run and jump all day? He will never be so busy again all his life long. Plato, in his Republic, which is considered so stern, teaches the children only through festivals, games, songs, and amusements. It seems as if he had accomplished his purpose when he had taught them to be happy; and Seneca, speaking of the Roman lads in olden days, says, "They were always on their feet, they were never taught anything which kept them sitting." Were they any the worse for it in manhood? Do not be afraid, therefore, of this so-called idleness. What would you think of a man who refused to sleep lest he should waste part of his life? You would say, "He is mad; he is not enjoying his life, he is robbing himself of part of it; to avoid sleep he is hastening his death." Remember that these two cases are alike, and that childhood is the sleep of reason.The apparent ease with which children learn is their ruin. You fail to see that this very facility proves that they are not learning. Their shining, polished brain reflects, as in a mirror, the things you show them, but nothing sinks in. The child remembers the words and the ideas are reflected back; his hearers understand them, but to him they are meaningless.Although memory and reason are wholly different faculties, the one does not really develop apart from the other. Before the age of reason the child receives images, not ideas; and there is this difference between them: images are merely the pictures of external objects, while ideas are notions about those objects determined by their relations.”

“I had brought from Paris the national prejudice against Italian music; but I had also received from nature that acute sensibility against which prejudices are powerless. I soon contracted the passion it inspires in all those born to understand it.”

“Teach your scholar to observe the phenomena of nature; you will soon rouse his curiosity, but if you would have it grow, do not be in too great a hurry to satisfy this curiosity. Put the problems before him and let him solve them himself. Let him know nothing because you have told him, but because he has learnt it for himself. Let him not be taught science, let him discover it. If ever you substitute authority for reason he will cease to reason; he will be a mere plaything of other people's thoughts.”

“It is reason which breeds pride and reflection which fortifies it; reason which turns man inward into himself; reason which separates him from everything which troubles or affects him. It is philosophy which isolates a man, and prompts him to say in secret at the sight of another suffering: 'Perish if you will; I am safe.' No longer can anything but dangers to society in general disturb the tranquil sleep of the philosopher or drag him from his bed. A fellow-man may with impunity be murdered under his window, for the philosopher has only to put his hands over his ears and argue a little with himself to prevent nature, which rebels inside him, from making him identify himself with the victim of the murder. The savage man entirely lacks this admirable talent, and for want of wisdom and reason he always responds recklessly to the first promptings of human feeling.”