The character of virtue, it is evident, must either be ascribed indifferently to all our affections, when under proper government and direction; or it must be confined to some one class or division of them. The great division of our affections is into the selfish and the benevolent. If the character of virtue, therefore, cannot be ascribed indifferently to all our affections, when under proper government and direction, it must be confined either to those which aim directly at our own private happiness, or to those which aim directly at that of others. If virtue, therefore, does not consist in propriety, it must consist either in prudence or in benevolence. Besides these three, it is scarce possible to imagine that any other account can be given of the nature of virtue. I shall endeavour to shew hereafter how all the other accounts, which are seemingly different from any of these, coincide at bottom with some one or other of them. CHAP. I. _Of those systems which make virtue consist in propriety._ According to Plato, to Aristotle, and to Zeno, virtue consists in the propriety of conduct, or in the suitableness of the affection from which we act to the object which excites it. I. In the system of Plato[8] the soul is considered as something like a little state or republic, composed of three different faculties or orders. Footnote 8: See Plato de Rep. lib. iv. The first is the judging faculty, the faculty which determines not only what are the proper means for attaining any end, but also what ends are fit to be pursued, and what degree of relative value we ought to put upon each. This faculty Plato called, as it is very properly called reason, and considered it as what had a right to be the governing principle of the whole. Under this appellation, it is evident, he comprehended not only that faculty by which we judge of truth and falsehood, but that by which we judge of the propriety or impropriety of desires and affections. The different passions and appetites, the natural subject of this ruling principle, but which are so apt to rebel against their master, he reduced to two different classes or orders. The first consisted of those passions, which are founded in pride and resentment, or in what the schoolmen called the irascible part of the soul; ambition, animosity, the love of honour, and the dread of shame, the desire of victory, superiority, and revenge; all those passions, in short, which are supposed either to rise from, or to denote what, by a metaphor in our language, we commonly call spirit or natural fire. The second consisted of those passions which are founded in the love of pleasure, or in what the schoolmen called the concupiscible part of the soul. It comprehended all the appetites of the body, the love of ease and security, and of all sensual gratifications.