Again, the cases of the arts and the virtues are not parallel: because those things which are produced by the arts have their excellence in themselves, and it is sufficient therefore that these when produced should be in a certain state: but those which are produced in the way of the virtues, are, strictly speaking, actions of a certain kind (say of Justice or perfected Self-Mastery), not merely if in themselves they are in a certain state but if also he who does them does them being himself in a certain state, first if knowing what he is doing, next if with deliberate preference, and with such preference for the things’ own sake; and thirdly if being himself stable and unapt to change. Now to constitute possession of the arts these requisites are not reckoned in, excepting the one point of knowledge: whereas for possession of the virtues knowledge avails little or nothing, but the other requisites avail not a little, but, in fact, are all in all, and these requisites as a matter of fact do come from oftentimes doing the actions of Justice and perfected Self-Mastery. The facts,[8] it is true, are called by the names of these habits when they are such as the just or perfectly self-mastering man would do; but he is not in possession of the virtues who merely does these facts, but he who also so does them as the just and self-mastering do them. We are right then in saying, that these virtues are formed in a man by his doing the actions; but no one, if he should leave them undone, would be even in the way to become a good man. Yet people in general do not perform these actions, but taking refuge in talk they flatter themselves they are philosophising, and that they will so be good men: acting in truth very like those sick people who listen to the doctor with great attention but do nothing that he tells them: just as these then cannot be well bodily under such a course of treatment, so neither can those be mentally by such philosophising. Chapter IV. Next, we must examine what Virtue is.[9] Well, since the things which come to be in the mind are, in all, of three kinds, Feelings, Capacities, States, Virtue of course must belong to one of the three classes. By Feelings, I mean such as lust, anger, fear, confidence, envy, joy, friendship, hatred, longing, emulation, compassion, in short all such as are followed by pleasure or pain: by Capacities, those in right of which we are said to be capable of these feelings; as by virtue of which we are able to have been made angry, or grieved, or to have compassionated; by States, those in right of which we are in a certain relation good or bad to the aforementioned feelings; to having been made angry, for instance, we are in a wrong relation if in our anger we were too violent or too slack, but if we were in the happy medium we are in a right relation to the feeling. And so on of the rest.