[38] Accordingly, in consequence of this opinion of his purchaser, he was appointed superintendent of his house, apparently indeed by his master, but, in fact and reality, by nature herself, which procured for him the government of a mighty city, and nation, and country. For it was necessary that one who was destined to be a statesman should be previously practised and trained in the management of a single household; for a household is a city on a small and contracted scale, and the management of a household is a contracted kind of polity; so that a city may be called a large house, and the government of a city a widely spread economy.