Nicomachean Ethics

Now what the genus of Virtue is has been said; but we must not merely speak of it thus, that it is a state but say also what kind of a state it is.

We must observe then that all excellence makes that whereof it is the excellence both to be itself in a good state and to perform its work well. The excellence of the eye, for instance, makes both the eye good and its work also: for by the excellence of the eye we see well. So too the excellence of the horse makes a horse good, and good in speed, and in carrying his rider, and standing up against the enemy. If then this is universally the case, the excellence of Man, i.e. Virtue, must be a state whereby Man comes to be good and whereby he will perform well his proper work. Now how this shall be it is true we have said already, but still perhaps it may throw light on the subject to see what is its characteristic nature.

In all quantity then, whether continuous or discrete,[11] one may take the greater part, the less, or the exactly equal, and these either with reference to the thing itself, or relatively to us: and the exactly equal is a mean between excess and defect. Now by the mean of the thing, absolute mean, I denote that which is equidistant from either extreme (which of course is one and the same to all), and by the mean relatively to ourselves, that which is neither too much nor too little for the particular individual. This of course is not one nor the same to all: for instance, suppose ten is too much and two too little, people take six for the absolute mean; because it exceeds the smaller sum by exactly as much as it is itself exceeded by the larger, and this mean is according to arithmetical proportion.[12]

But the mean relatively to ourselves must not be so found ; for it does not follow, supposing ten minæ[13] is too large a quantity to eat and two too small, that the trainer will order his man six; because for the person who is to take it this also may be too much or too little: for Milo it would be too little, but for a man just commencing his athletic exercises too much: similarly too of the exercises themselves, as running or wrestling.

So then it seems every one possessed of skill avoids excess and defect, but seeks for and chooses the mean, not the absolute but the relative.

Now if all skill thus accomplishes well its work by keeping an eye on the mean, and bringing the works to this point (whence it is common enough to say of such works as are in a good state, “one cannot add to or take ought from them,” under the notion of excess or defect destroying goodness but the mean state preserving it), and good artisans, as we say, work with their eye on this, and excellence, like nature, is more exact and better than any art in the world, it must have an aptitude to aim at the mean.

It is moral excellence, Virtue, of course which I mean, because this it is which is concerned with feelings and actions, and in these there can be excess and defect and the mean: it is possible, for instance, to feel the emotions of fear, confidence, lust, anger, compassion, and pleasure and pain generally, too much or too little, and in either case wrongly; but to feel them when we ought, on what occasions, towards whom, why, and as, we should do, is the mean, or in other words the best state, and this is the property of Virtue.

In like manner too with respect to the actions, there may be excess and defect and the mean. Now Virtue is concerned with feelings and actions, in which the excess is wrong and the defect is blamed but the mean is praised and goes right; and both these circumstances belong to Virtue. Virtue then is in a sense a mean state, since it certainly has an aptitude for aiming at the mean.

Again, one may go wrong in many different ways (because, as the Pythagoreans expressed it, evil is of the class of the infinite, good of the finite), but right only in one; and so the former is easy, the latter difficult; easy to miss the mark, but hard to hit it: and for these reasons, therefore, both the excess and defect belong to Vice, and the mean state to Virtue; for, as the poet has it,

“Men may be bad in many ways, But good in one alone.”