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.