"People, I declare to you that this Moon is not a Moon, but a World; and that World is not a World but a Moon. For your priests think good that you should believe this."

After I had cried the same thing in the five principal squares of the city, I perceived my defender holding out his hand to help me to get down. I was vastly surprised to recognise him when I looked in his face, for he was my demon. We embraced each other for an hour.

"Come away home with me", said he, "for if you return to Court you will be frowned upon after a shameful amends. Moreover I must tell you that you would still be with the Monkeys, like your friend the Spaniard, if I had not published abroad the vigour and strength of your wit and secured in your favour the protection of the nobles against the prophets."

I had barely finished thanking him when we reached his lodging. Before our meal he told me of the wheels he had set in motion to force the priests to let me be heard, in spite of all the specious scruples with which they had wheedled the people's conscience. We sat before a large fire, because the weather was cold, and I think he was going on to tell me what he had done during the time I had not seen him, when they came to inform us that supper was ready.

"I have invited", he went on, "two professors from the academy of this town to eat with us this evening. I will bring them round to the subject of the philosophy taught in this world. You will also see my host's son. I have never met a young man so full of wit and he would be a second Socrates if he could regulate his knowledge and not stifle in vice the grace with which God continually visits him and cease to affect impiety out of mere ostentation. I have taken up my lodging here to find some occasion for instructing him."

He was silent as if to give me an opportunity of speaking in my turn; then he made a sign that they should divest me of the shameful ornaments with which I was still brilliant. Almost at the same time the two professors we were waiting for entered and we all four went off to the dining-room, where we found the young man he had spoken of already eating. They made him profound bows and treated him with a respect as deep as that of a slave for his lord. I asked my demon the reason of this, and he replied that it was on account of his age, because in that world the old render every deference and honour to the young. And more: the fathers obey their children, as soon as the latter have attained the age of reason in the opinion of the Senate of philosophers.

"You are surprised", he continued, "at a custom so contrary to that of your country? But there is nothing contrary to right reason in it for, tell me on your conscience, when a warm young fellow is most apt to imagine, to judge and to execute, is he not more capable of governing a family than an infirm man of sixty? The poor dullard, whose imagination is frozen by the snow of sixty winters, acts from the experience of fortunate successes, yet it was not he but his fortune which made them so, against all the rules and the whole management of human prudence.

"As to judgment he has just as little, although the common opinion of your world makes it a prerogative of old age. To remove this error, it must be known that what in an old man is called prudence is simply a panic apprehension, a mad fear of undertaking anything, which becomes an obsession. And so, my son, when he has not risked a danger by which a young man has been ruined, it was not because he foresaw the catastrophe but because he lacked fire to kindle those noble ardours which make us dare; and in that young man boldness was, as it were, a pledge of the success of his plan, because that spirit which gives promptitude and facility of execution is precisely that which urged him to undertake it.

"As to his carrying things out, I should be wronging your wit did I labour to convince it by proofs. You know that youth alone is fit for action; and if you are not fully persuaded of this, tell me, I beg you, when you respect a brave man is it not because he can avenge you upon your enemies or your oppressors? Why then should you still consider him such, except from habit, when a battalion of seventy Januaries has frozen his blood and killed with cold all the noble enthusiasms which inflame young persons in the cause of justice? When you defer to the strong man is it not in order that he may be obliged to you for a victory which you could not dispute? Why then should you submit to him, when idleness has melted his muscles, weakened his arteries, evaporated his spirits and sucked the marrow from his bones?

"If you adore a woman, is it not because of her beauty? Why then continue your genuflections when old age has made her a phantom menacing the living with death? In fine, when you honour a witty man it is because through the liveliness of his genius he grasps a tangled affair and unravels it, because he delights the most distinguished assembly with his talk, because he digests the sciences into a single thought, and a noble soul will never form a more violent desire than to resemble him; and yet you continue to pay homage to him when his outworn organs render his head imbecile and heavy and his silence in company makes him rather like the statue of a Household God than a man capable of reason. Resolve yourself, my son, it is better that young men should be given the control of families than old men. Certainly, you would be very weak to think that Hercules, Achilles, Epaminondas, Alexander and Caesar, who all died before they were forty, were persons to whom one would owe no more than ordinary courtesies, while bringing incense to a doting old fool simply because the Sun had ninety times looked upon his harvest.