5. (i) By the admirable method of transacting business which is in common use. For, as the head of a household makes use of various craftsmen when he has no leisure time to prepare what is necessary for his household economy, why should he make any difference in the case of education? When he needs flour, he goes to the miller; when flesh, to the butcher; when drink, to the inn-keeper; when clothing, to the tailor; when shoes, to the cobbler; when a house, a ploughshare, or a key, to the builder, the smith, or the locksmith. Again, we have churches for religious instruction, and law courts and assembly rooms in which to discuss the causes of litigants and make weighty announcements to the assembled people; why not schools also for the young? Farmers do not feed their own pigs and cows, but keep hired herdsmen who feed them all at one time, while their masters, free from distraction, transact their own business. For this is a marvellous saving of labour, when one man, undisturbed by other claims on his attention, confines himself to one thing; in this way one man can be of use to many, and many to one man.
6. (ii) By necessity, because it is very seldom that parents have sufficient ability or sufficient leisure to teach their children. The consequence is that there has arisen a class of men who do this one thing alone, as a profession, and that by this means the advantage of the whole community is attained.
7. (iii) And although there might be parents with leisure to educate their own children, it is nevertheless better that the young should be taught together and in large classes, since better results and more pleasure are to be obtained when one pupil serves as an example and a stimulus for another. For to do what we see others do, to go where others go, to follow those who are ahead of us, and to keep in front of those who are behind us, is the course of action to which we are all most naturally inclined.
It is when the steed has rivals to surpass or leaders to follow,
That he runs his best.
