[104] [cap.28] "On this account shall he cultivate the earth;" [68] he does not say, "He shall become a farmer." For every farmer is an artist, because farming is an art. But any of the common people are cultivators of the earth, giving their service to provide themselves with necessaries, without any skill. These men, then, as they have no superintendent in all that they do, do much harm; and whatever they do well they do by chance, and not in accordance with reason. But the works of farmers, which are performed according to knowledge, are all of them, of necessity, useful.