Plutarch, De liberis educandis
William W. Goodwin, Ed.

I say now, that children are to be won to follow liberal studies by exhortations and rational motives, and on no account to be forced thereto by whipping or any other contumelious punishments. I will not urge that such usage seems to be more agreeable to slaves than to ingenuous children; and even slaves, when thus handled, are dulled and discouraged from the performance of their tasks, partly by reason of the smart of their stripes, and partly because of the disgrace thereby inflicted. But praise and reproof are more effectual upon free-born children than any such disgraceful handling; the former to incite them to what is good, and the latter to restrain them from that which is evil. But we must use reprehensions and commendations alternately, and of various kinds according to the occasion; so that when they grow petulant, they may be shamed by reprehension, and again, when they better deserve it, they may be encouraged by commendations. Wherein we ought to imitate nurses, who, when they have made their infants cry, stop their mouths with the nipple to quiet them again. It is also useful not to give them such large commendations as to puff them up with pride; for this is the ready way to fill them with a vain conceit of themselves, and to enfeeble their minds.