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It is right to rebuke some fathers who, after entrusting their sons to attendants and masters, do not themselves take cognizance at all of their instruction by means of their own eyes or their own ears. Herein they most fail in their duty; for they ought themselves every few days to test their children, and not rest their hopes upon the disposition of a hired person; for even those persons will devote more attention to the children if they know they must from time to time render an account. And in this connexion there is point as well as wit in the remark of the groom who said that nothing makes the horse so fat as the king’s eye.Xenophon, Oeconomicus, 12. 20.