Plutarch De recta ratione audiendi 2

[2] We may find a comparison in the case of newly naturalized citizens; those among them who were alien born and perfect strangers find fault with many of the things that are done, and are discontented; whereas those who come from the class of resident aliens, having been brought up under our laws and grown to be well acquainted with them, have no difficulty in accepting what devolves upon them and are content. And so you, who have been brought up for a long time in contact with philosophy, and have from the beginning been accustomed to philosophic reasoning as an ingredient in every portion of early instruction and information, ought to feel like an old friend and familiar when you come to philosophy, which alone can array young men in the manly and truly perfect adornment that comes from reason.

I think you may not find unwelcome some preliminary remarks about the sense of hearing, which Theophrastus ¹ asserts is the most emotional of all the senses. For nothing which can be seen or tasted or touched brings on such distractions, confusions, and excitements, as take possession of the soul when certain crashing, clashing, and roaring noises assail the hearing. Yet this sense is more rational than emotional. For while many places and parts of the body make way for vice to enter through them and fasten itself upon the soul, virtue’s only hold upon the young is afforded by the ears, if they be uncontaminated and kept from the outset unspoiled by flattery and untouched by vile words. For this reason Xenocrates ² advised putting ear-protectors on children rather than on athletes, on the ground that the latter have only their ears disfigured by the blows they receive, while the former have their characters disfigured by the words they hear; not that he would thus court heedlessness or deafness, but he advises vigilance against vile words, until such time as other words, of good sort, fostered in the character by philosophy, should, like watchmen, have taken under their charge the post chiefly exposed to influence and persuasion. And Bias ³ of old, on receiving orders to send to Amasis the portion of the sacrificial animal which was at the same time the best and the worst, cut out the tongue and sent it to him, on the ground that speech contains both injuries and benefits in the largest measure. Most people in bestowing an affectionate kiss on little children not only take hold of the children by the ears but bid the children to do the same by them, thus insinuating in a playful way that they must love most those who confer benefit through the ears. For surely the fact is plain, that the young man who is debarred from hearing all instruction and gets no taste of speech not only remains wholly unfruitful and makes no growth towards virtue, but may also be perverted towards vice, and the product of his mind, like that of a fallow and untilled piece of ground, will be a plentiful crop of wild oats. For if the impulses towards pleasure and the feelings of suspicion towards hard work (which are not of external origin nor imported products of the spoken word, but indigenous sources, as it were, of pestilent emotions and disorders without number) be allowed to continue unconstrained along their natural channels, and if they be not either removed or diverted another way through the agency of goodly discourse, thus putting the natural endowments in a fit condition, there is not one of the wild beasts but would be found more civilized than man. ⁴