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But to let these things pass, I would gladly know of them, whether, when they see domestic animals (as dogs, horses, or birds) by use, feeding, and teaching brought to so high a degree of perfection as that they shall utter articulately some senseful words, and by their motions, gestures, and all their actions, shall approve themselves governable, and become useful to us; and when also they find Achilles in Homer encouraging horses, as well as men, to battle;—whether, I say, after all this, they can yet make any wonder or doubt, whether those faculties of the mind to which we owe our anger, our desires, our joys, and our sorrows, be of such a nature that they are capable of being obedient to reason, and so affected by it as to consent and become entirely subject to it; considering especially that these faculties are not seated without us, or separated from us, or formed by any thing which is not in us, or hammered out by force and violence, but, as they have by nature their entire dependence upon the soul, so they are ever conversant and bred up with it, and also receive their final complement and perfection from use, custom, and practice. For this reason the Greeks very properly call manners ἦθος, custom; for they are nothing else, in short, but certain qualities of the irrational and brutal part of the mind, and hence by them are so named, in that this brutal and irrational part of the mind being formed and moulded by right reason, by long custom and use (which they call ἔθος), has these qualities or differences stamped upon it. Not that reason so much as attempts to eradicate our passions and affections, which is neither possible nor expedient, but only to keep them within due bounds, reduce them into good order, and so direct them to a good end; and thus to generate moral virtue, consisting not in a kind of insensibility, or total freedom from passions, but in the well-ordering our passions and keeping them within measure, which she effects by wisdom and prudence, bringing the faculties of that part of the soul where our affections and appetite are seated to a good habit. For these three things are commonly held to be in the soul, namely, a faculty or aptitude, passion, and habit. This aptitude or faculty then is the principle or very matter of passions; as for example, the power or aptitude to be angry, to be ashamed, to be confident and bold, or the like; passion is the actual exercise of that aptitude or faculty, as anger, shame, confidence, or boldness; and habit is the strength, firmness, and establishment of the disposition or faculty in the irrational part of the soul, gotten by continual use and custom, and which, according as the passions are well or ill governed by reason, becomes either virtue or vice.
