And this is confirmed by the fact that in sleep this part of the soul, or this faculty, is thought to be most active, while the good and the bad man are undistinguishable when they are asleep (whence the saying that for half their lives there is no difference between the happy and the miserable; which indeed is what we should expect; for sleep is the cessation of the soul from those functions in respect of which it is called good or bad), except that they are to some slight extent roused by what goes on in their bodies, with the result that the dreams of the good man are better than those of ordinary people.
However, we need not pursue this further, and may dismiss the nutritive principle, since it has no place in the excellence of man.