[109] [cap.29] Accordingly the bad man never ceases from employing, without any of the principles of art, his earth-like body, and the outward senses which are akin to it, and all the external objects of these outward senses, and he injures his miserable soul, and he also injures what he fancies he is benefiting exceedingly, his own body. But the good man, for he has skill in the art of a farmer, manages the whole of his materials in accordance with the principles of art and reason; for when the outward senses behave insolently, being borne forward with irresistible impetuosity towards the external objects of the outward senses, they are easily restrained by some contrivance among those which art has devised;