II. Virtue, according to Aristotle (Ethica Nicomachea 1. 2. c. 5. et seq. et 1. 3. c. 4. et seq.), consists in the habit of mediocrity according to right reason. Every particular virtue, according to him, lies in a kind of middle between two opposite vices, of which the one offends from being too much, the other from being too little affected by a particular species of objects. Thus the virtue of fortitude or courage lies in the middle between the opposite vices of cowardice and of presumptuous rashness, of which the one offends from being too much, and the other from being too little affected by the objects of fear. Thus too the virtue of frugality lies in a middle between avarice and profusion, of which the one consists in an excess, the other in a defect of the proper attention to the objects of self-interest. Magnanimity, in the same manner, lies in a middle between the excess of arrogance and the defect of pusillanimity, of which the one consists in too extravagant, the other in too weak a sentiment of our own worth and dignity. It is unnecessary to observe that this account of virtue corresponds, too, pretty exactly with what has been said above concerning the propriety and impropriety of conduct.
According to Aristotle (Ethica Nicomachea lib. II ch. 1, 2, 3, and 4.), indeed, virtue did not so much consist in those moderate and right affections, as in the habit of this moderation. In order to understand this, it is to be observed, that virtue may be considered either as the quality of an action, or the quality of a person. Considered as the quality of an action, it consists, even according to Aristotle, in the reasonable moderation of the affection from which the action proceeds, whether this disposition be habitual to the person or not. Considered as the quality of a person, it consists in the habit of this reasonable moderation, in its having become the customary and usual disposition of the mind. Thus the action which proceeds from an occasional fit of generosity is undoubtedly a generous action, but the man who performs it, is not necessarily a generous person, because it may be the single action of the kind which he ever performed. The motive and disposition of heart, from which this action was performed, may have been quite just and proper: but as this happy mood seems to have been the effect rather of accidental humour than of anything steady or permanent in the character, it can reflect no great honour on the performer. When we denominate a character generous or charitable, or virtuous in any respect, we mean to signify that the disposition expressed by each of those appellations is the usual and customary disposition of the person. But single actions of any kind, how proper and suitable soever, are of little consequence to show that this is the case. If a single action was sufficient to stamp the character of any virtue upon the person who performed it, the most worthless of mankind might lay claim to all the virtues; since there is no man who has not, upon some occasions, acted with prudence, justice, temperance, and fortitude. But though single actions, how laudable soever, reflect very little praise upon the person who performs them, a single vicious action performed by one whose conduct is usually pretty regular, greatly diminishes and sometimes destroys altogether our opinion of his virtue. A single action of this kind sufficiently shows that his habits are not perfect, and that he is less to be depended upon, than, from the usual train of his behaviour, we might have been apt to imagine.
Aristotle too (Magna Moralia lib. I ch. I) when he made virtue to consist in practical habits, had it probably in his view to oppose the doctrine of Plato, who seems to have been of opinion that just sentiments and reasonable judgments concerning what was fit to be done or to be avoided, were alone sufficient to constitute the most perfect virtue. Virtue, according to Plato, might be considered as a species of science, and no man, he thought, could see clearly and demonstratively what was right and what was wrong, and not act accordingly. Passion might make us act contrary to doubtful and uncertain opinions, not to plain and evident judgments. Aristotle, on the contrary, was of opinion that no conviction of the understanding was capable of getting the better of inveterate habits, and that our good morals arose not from knowledge but from action.
III. According to Zeno,7 the founder of the Stoical doctrine, every animal was by nature recommended to its own care, and was endowed with the principle of self-love, that it might endeavour to preserve, not only its existence, but all the different parts of its nature, in the best and most perfect state of which they were capable.
The self-love of man embraced, if I may say so, his body and all its different members, his mind and all its different faculties and powers, and desired the preservation and maintenance of them all in their best and most perfect condition. Whatever tended to support this state of existence was, therefore, by nature pointed out to him as fit to be chosen; and whatever tended to destroy it, as fit to be rejected. Thus health, strength, agility, and ease
