1. Virtue in its most transcendental sense means the excellence of a thing according to its kind. Thus it is the virtue of the eye to see, and of a horse to be fleet of foot. Vice is a flaw in the make of a thing, going to render it useless for the purpose to which it was ordained. From the ethical standpoint, virtue is a habit that a man has got of doing moral good, or doing that which it befits his rational nature to do: and vice is a habit of doing moral evil. (See c. i., n. 5.) It is important to observe that virtue and vice are not acts but habits. Vices do not make a man guilty, nor do virtues make him innocent. A man is guilty or innocent according to his acts, not according to his habits. A man may do a wicked thing and not be vicious, or a good action and not be virtuous. But no man is vicious who has not done one, two, aye, many wicked things: and to be virtuous, a man must have performed many acts of virtue. Children do right and wrong, but they have neither virtues nor vices except in a nascent state: there has not yet been time in them for the habits to be formed. When sin is taken away by God and pardoned, the vice, that is, the evil habit, if any such existed before, still remains, and constitutes a danger for the future. The habit can only be overcome by watchfulness and a long continuance of contrary acts. But vice is not sin, nor is sin vice, nor a good deed a virtue.
2. The name of virtue is given to certain habits residing in the intellect, as intuition or insight (into self-evident truths), wisdom (regarding conclusions of main application), science (of conclusions in special departments), and art. These are called intellectual virtues.
It was a peculiarity of Socrates' teaching, largely shared by Plato, to make all virtue intellectual, a doctrine expressed in the formula, Virtue is knowledge; which is tantamount to this other, Vice is ignorance, or an erroneous view. From whence the conclusion is inevitable: No evil deed is wilfully done; and therefore, No man is to blame for being wicked.
3. Undoubtedly there is a certain element of ignorance in all vice, and a certain absence of will about every vicious act. There is likewise an intellectual side to all virtue. These positions we willingly concede to the Socratics. Every morally evil act is borne of some voluntary inconsiderateness. The agent is looking the wrong way in the instant at which he does wrong. Either he is regarding only the solicitations of his inferior nature to the neglect of the superior, or he is considering some rational good indeed, but a rational good which, if he would look steadily upon it, he would perceive to be unbefitting for him to choose. No man can do evil in the very instant in which his understanding is considering, above all things else, that which it behoves him specially to consider in the case. Again, in every wrong act, it is not the sheer evil that is willed, but the good through or with the evil. Good, real or supposed, is sought for: evil is accepted as leading to good in the way of means, or annexed thereto as a circumstance. Moreover, no act is virtuous that is elicited quite mechanically, or at the blind instance of passion. To be virtuous, the thing must be done on principle, that is, at the dictate of reason and by the light of intellect.
4. Still, virtue is not knowledge. There are other than intellectual habits needed to complete the character of a virtuous man. "I see the better course and approve it, and follow the worse," said the Roman poet. [Footnote 3] "The evil which I will not, that I do," said the Apostle. It is not enough to have an intellectual discernment of and preference for what is right: but the will must be habituated to embrace it, and the passions too must be habituated to submit and square themselves to right being done. In other words, a virtuous man is made up by the union of enlightened intellect with the moral virtues. The addition is necessary for several reasons.
[Footnote 3: Video meliora proboque,/Deteriora sequor. (Ovid, Metamorph., vii., 21.)]
(a) Ordinarily, the intellect does not necessitate the will. The will, then, needs to be clamped and set by habit to choose the right thing as the intellect proposes it.
(b) Intellect, or Reason, is not absolute in the human constitution. As Aristotle (Pol., I., v., 6) says: "The soul rules the body with a despotic command: but reason rules appetite with a command constitutional and kingly": that is to say, as Aristotle elsewhere (Eth., I., xiii., 15, 16) explains, passion often "fights and resists reason, opposes and contradicts": it has therefore to be bound by ordinances and institutions to follow reason's lead: these institutions are good habits, moral virtues, resident there where passion itself is resident, in the inferior appetite. It is not enough that the rider is competent, but the horse too must be broken in.
(c) It is a saying, that "no mortal is always wise." There are times when reason's utterance is faint from weariness and vexation. Then, unless a man has acquired an almost mechanical habit of obeying reason in the conduct of his will and passions, he will in such a conjuncture act inconsiderately and do wrong. That habit is moral virtue. Moral virtue is as the fly-wheel of an engine, a reservoir of force to carry the machine past the "dead points" in its working. Or again, moral virtue is as discipline to troops suddenly attacked, or hard pressed in the fight.
5. Therefore, besides the habits in the intellect that bear the name of intellectual virtues, the virtuous man must possess other habits, as well in the will, that this power may readily embrace what the understanding points out to be good, as in the sensitive appetite in both its parts, concupiscible and irascible, so far forth as appetite is amenable to the control of the will, that it may be so controlled and promptly obey the better guidance. These habits in the will and in the sensitive appetite are called moral virtues, and to them the name of virtue is usually confined.