Aristotle, Nicomachean Ethics
H. Rackham, Ed.

For the possession of an art, none of these conditions is included, except the mere qualification of knowledge; but for the possession of the virtues, knowledge is of little or no avail, whereas the other conditions, so far from being of little moment, are all-important, inasmuch as virtue results from the repeated performance of just and temperate actions. [4] Thus although actions are entitled just and temperate when they are such acts as just and temperate men would do, the agent is just and temperate not when he does these acts merely, but when he does them in the way in which just and temperate men do them. [5] It is correct therefore to say that a man becomes just by doing just actions and temperate by doing temperate actions; and no one can have the remotest chance of becoming good without doing them. [6] But the mass of mankind, instead of doing virtuous acts, have recourse to discussing virtue, and fancy that they are pursuing philosophy and that this will make them good men. In so doing they act like invalids who listen carefully to what the doctor says, but entirely neglect to carry out his prescriptions. That sort of philosophy will no more lead to a healthy state of soul than will the mode of treatment produce health of body.5.

We have next to consider the formal definition of virtue.

A state of the soul is either （l） an emotion, （2） a capacity, or （3） a disposition; virtue therefore must be one of these three things. [2] By the emotions, I mean desire, anger, fear, confidence, envy, joy, friendship, hatred, longing, jealousy, pity; and generally those states of consciousness which are accompanied by pleasure or pain. The capacities are the faculties in virtue of which we can be said to be liable to the emotions, for example, capable of feeling anger or pain¹ or pity. The dispositions are the formed states of character in virtue of which we are well or ill disposed in respect of the emotions; for instance, we have a bad disposition in regard to anger if we are disposed to get angry too violently or not violently enough, a good disposition if we habitually feel a moderate amount of anger; and similarly in respect of the other emotions. [3]

Now the virtues and vices are not emotions because we are not pronounced good or bad according to our emotions, but we are according to our virtues and vices; nor are we either praised or blamed for our emotions—a man is not praised for being frightened or angry, nor is he blamed for being angry merely, but for being angry in a certain way—