Similarly men think that to know what is just and what is unjust needs no great wisdom, since anyone can inform himself about those things which the law prescribes (though these things are only accidentally, not essentially, just): but to know how these acts must be done and how these distributions must be made in order to be just⁠—that indeed is a harder matter than to know what conduces to health; though that is no easy matter. It is easy enough to know the meaning of honey, and wine, and hellebore, and cautery, and the knife, but to know how, and to whom, and when they must be applied in order to produce health, is so far from being easy, that to have this knowledge is to be a physician.