XIV. Herein, indeed, the mind and body are unlike: that though the mind when in perfect health may be visited by sickness, as the body may, yet the body may be disordered without our fault; the mind cannot. For all the disorders and perturbations of the mind proceed from a neglect of reason; these disorders, therefore, are confined to men: the beasts are not subject to such perturbations, though they act sometimes as if they had reason. There is a difference, too, between ingenious and dull men; the ingenious, like the Corinthian brass, which is long before it receives rust, are longer before they fall into these perturbations, and are recovered sooner: the case is different with the dull. Nor does the mind of an ingenious man fall into every kind of perturbation, for it never yields to any that are brutish and savage; and some of their perturbations have at first even the appearance of humanity, as mercy, grief, and fear. But the sicknesses and diseases of the mind are thought to be harder to eradicate than those leading vices which are in opposition to virtues; for vices may be removed, though the diseases of the mind should continue, which diseases are not cured with that expedition with which vices are removed. I have now acquainted you with the arguments which the Stoics put forth with such exactness; which they call logic, from their close arguing: and since my discourse has got clear of these rocks, I will proceed with the remainder of it, provided I have been sufficiently clear in what I have already said, considering the obscurity of the subject I have treated.
_A._ Clear enough; but should there be occasion for a more exact inquiry, I shall take another opportunity of asking you. I expect you now to hoist your sails, as you just now called them, and proceed on your course.
XV. _M._ Since I have spoken before of virtue in other places, and shall often have occasion to speak again (for a great many questions that relate to life and manners arise from the spring of virtue); and since, as I say, virtue consists in a settled and uniform affection of mind, making those persons praiseworthy who are possessed of her, she herself also, independent of anything else, without regard to any advantage, must be praiseworthy; for from her proceed good inclinations, opinions, actions, and the whole of right reason; though virtue may be defined in a few words to be right reason itself. The opposite to this is viciousness (for so I choose to translate what the Greeks call [Greek: kakia], rather than by perverseness; for perverseness is the name of a particular vice; but viciousness includes all), from whence arise those perturbations which, as I just now said, are turbid and violent motions of the mind, repugnant to reason, and enemies in a high degree to the peace of the mind and a tranquil life, for they introduce piercing and anxious cares, and afflict and debilitate the mind through fear; they violently inflame our hearts with exaggerated appetite, which is in reality an impotence of mind, utterly irreconcilable with temperance and moderation, which we sometimes call desire, and sometimes lust, and which, should it even attain the object of its wishes, immediately becomes so elated that it loses all its resolution, and knows not what to pursue; so that he was in the right who said "that exaggerated pleasure was the very greatest of mistakes." Virtue, then, alone can effect the cure of these evils.