But as all duties proceed from the first principles of nature, it follows inevitably that wisdom itself must proceedfrom the same source. But as it often happens, that he who has been recommended to any one considers him to whom he has been recommended of more importance than him who recommended him; so it is not at all strange that in the first instance we are recommended to wisdom by the principles of nature, but that subsequently wisdom herself becomes dearer to us than the starting place from which we arrive at it. And as limbs have been given to us in such a way that it is plain they have been given for some purpose of life; so that appetite of the mind which in Greek is called ὁρμὴ, appears to have been given to us, not for any particular kind of life, but rather for some especial manner of living: and so too is system and perfect method. For as an actor employs gestures, and a dancer motions, not practising any random movement, but a regular systematic action; so life must be passed according to a certain fixed kind, and not any promiscuous way, and that certain kind we call a suitable and harmonious one. Nor do we think wisdom similar to the art of navigation or medicine, but rather to that kind of action which I have spoken of, and to dancing; I mean, inasmuch as the ultimate point, that is to say, the production of the art, lies in the art itself, and is not sought for from foreign sources. And yet there are other points in which there is a difference between wisdom and those arts; because in those arts those things which are done properly do nevertheless not comprise all the parts of the arts of which they consist. But the things which we call right, or rightly done, if you will allow the expression, and which they call κατορθώματα, contain in them the whole completeness of virtue. For wisdom is the only thing which is contained wholly in itself; and this is not the case with the other arts.
And it is only out of ignorance that the object of the art of medicine or navigation is compared with the object of wisdom; for wisdom embraces greatness of mind and justice, and judges all the accidents which befal mankind beneath itself: and this too is not the case in the other arts. But no one will be able to maintain those very virtues of which I have just made mention, unless he lays down a rule that there is nothing which is of any importance, nothing which differs from anything else, except what is honourable or disgraceful.