Book 1: The End.
Chapter 9: It happiness acquired, or the gift of Gods or of chance?
This has led people to ask whether happiness is attained by learning, or the formation of habits, or any other kind of training, or comes by some divine dispensation or even by chance.
Well, if the Gods do give gifts to men, happiness is likely to be among the number, more likely, indeed, than anything else, in proportion as it is better than all other human things.
This belongs more properly to another branch of inquiry; but we may say that even if it is not heavensent, but comes as a consequence of virtue or some kind of learning or training, still it seems to be one of the most divine things in the world; for the prize and aim of virtue would appear to be better than anything else and something divine and blessed.
Again, if it is thus acquired it will be widely accessible; for it will then be in the power of all except those who have lost the capacity for excellence to acquire it by study and diligence.
And if it be better that men should attain happiness in this way rather than by chance, it is reasonable to suppose that it is so, since in the sphere of nature all things are arranged in the best possible way, and likewise in the sphere of art, and of each mode of causation, and most of all in the sphere of the noblest mode of causation. And indeed it would be too absurd to leave what is noblest and fairest to the dispensation of chance.
But our definition itself clears up the difficulty; for happiness was defined as a certain kind of exercise of the vital faculties in accordance with excellence or virtue. And of the remaining goods [other than happiness itself], some must be present as necessary conditions, while others are aids and useful instruments to happiness. And this agrees with what we said at starting. We then laid down that the end of the art political is the best of all ends; but the chief business of that art is to make the citizens of a certain character—that is, good and apt to do what is noble. It is not without reason, then, that we do not call an ox, or a horse, or any brute happy; for none of them is able to share in this kind of activity.
For the same reason also a child is not happy; he is as yet, because of his age, unable to do such things. If we ever call a child happy, it is because we hope he will do them. For, as we said, happiness requires not only perfect excellence or virtue, but also a full term of years for its exercise. For our circumstances are liable to many changes and to all sorts of chances, and it is possible that he who is now most prosperous will in his old age meet with great disasters, as is told of Priam in the tales of Troy; and a man who is thus used by fortune and comes to a miserable end cannot be called happy.