Nicomachean Ethics

man is exercise of his faculties in accordance with excellence or virtue, or, if there be more than one, in accordance with the best and most complete virtue. 14
But there must also be a full term of years for this exercise; 15 for one swallow or one fine day does not make a spring, nor does one day or any small space of time make a blessed or happy man.
This, then, may be taken as a rough outline of the good; for this, I think, is the proper method⁠—first to sketch the outline, and then to fill in the details. But it would seem that, the outline once fairly drawn, anyone can carry on the work and fit in the several items which time reveals to us or helps us to find. And this indeed is the way in which the arts and sciences have grown; for it requires no extraordinary genius to fill up the gaps.
We must bear in mind, however, what was said above, and not demand the same degree of accuracy in all branches of study, but in each case so much as the subject-matter admits of and as is proper to that kind of inquiry. The carpenter and the geometer both look for the right angle, but in different ways: the former only wants such an approximation to it as his work requires, but the latter wants to know what constitutes a right angle, or what is its special quality; his aim is to find out the truth. And so in other cases we must follow the same course, lest we spend more time on what is immaterial than on the real business in hand.
Nor must we in all cases alike demand the reason why; sometimes it is enough if the undemonstrated fact be fairly pointed out, as in the case of the starting-points or principles of a science. Undemonstrated facts always form the first step or starting-point of a science; and these starting-points or principles are arrived at some in one way, some in another⁠—some by induction, others by perception, others again by some kind of training. But in each case we must try to apprehend them in the proper way, and do our best to define them clearly; for they have great influence upon the subsequent course of an inquiry. A good start is more than half the race, I think, and our starting-point or principle, once found, clears up a number of our difficulties.

VIII
We must not be satisfied, then, with examining this starting-point or principle of ours as a conclusion from our data, but must also view it in its relation to current opinions on the subject; for all experience harmonizes with a true principle, but a false one is soon found to be incompatible with the facts.
Now, good things have been divided into three classes, external goods on the one hand, and on the other goods of the soul and goods of the body; and the goods of the soul are commonly said to be goods in the fullest sense, and more good than any other.
But “actions and exercises of the vital faculties or soul” may be said to be “of the soul.” So our account is confirmed by this opinion, which is both of long standing and approved by all who busy themselves with philosophy.
But, indeed, we secure the support of this opinion by the mere statement that certain actions and exercises are the end; for this implies that it is to be ranked among the goods of the soul, and not among external goods.
Our account, again, is in harmony with the common saying that the happy man lives well and does well; for we may say that happiness, according to us, is a living well and doing well.
And, indeed, all the characteristics that men expect to find in happiness seem to belong to happiness as we define it.
Some hold it to be virtue or excellence, some prudence, others a kind of wisdom; others, again, hold it to be all or some of these, with the addition of pleasure, either as an ingredient or as a necessary accompaniment; and some even include external prosperity in their account of it.
Now, some of these views have the support of many voices and of old authority; others have few voices, but those of weight; but it is probable that neither the one side nor the other is entirely wrong, but that in some one point at least, if not in most, they are both right.
First, then, the view that happiness is excellence or a kind of excellence harmonizes with our account; for “exercise of faculties in accordance with excellence” belongs to excellence.
But I think we may say that it makes no small difference whether the good be conceived as the mere possession of something, or as its use⁠—as a mere habit or trained faculty, or as the exercise of that faculty. For the habit or faculty may be present, and yet issue in no good result, as when a man is asleep, or in any other way hindered from his function; but with its exercise this is not possible, for it must show itself in acts and in good acts. And as at the Olympic games it is not the fairest and strongest who receive the crown, but those who contend (for among these are the victors), so in life, too, the winners are those who not only have all the excellences, but manifest these in deed.
And, further, the life of these men is in itself pleasant. For pleasure is an affection of the soul, and each man takes pleasure in that which he is said to love⁠—he who loves horses in horses, he who loves sightseeing in sightseeing, and in the same way he who loves justice in acts of justice, and generally the lover of excellence or virtue in virtuous acts or the manifestation of excellence.
And while with most men