[224a]
Stranger
Take, therefore, the liberal arts1 in general that constantly go about from city to city, bought in one place and carried to another and sold—painting, and conjuring, and the many other things that affect the soul, which are imported and sold partly for its entertainment and partly for its serious needs; we cannot deny that he who carries these about and sells them constitutes a merchant properly so called, no less than he whose business is the sale of food and drink.
Theaetetus
Very true.