XXIX. (109) 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; (110) but when an impetuous passion in the soul becomes violent, bringing forth voluptuous itchings and ticklings arising from pleasure or from appetite, or on the other hand, stings and agitation, caused by fear or grief, it is softened by the previously prepared saving medicine; and if any evil devouring as it goes, proceeds further, like a sister of the cancrous disease, which creeps over the body, it is cut out by reason which proceeds in its operations in accordance with knowledge. (111) In this manner then the trees of the wild wood are brought into a state of tameness, but all the plants of the cultivated and fruit-bearing virtues have for their shoots studies, and for their fruits virtuous actions, of each of which the farming skill of the soul promotes the growth, and as far as depends upon it, it makes them immortal by its industry.