concave circumferences, matters not in respect of our present purpose). And of the Irrational, the one part seems common to other objects, and in fact vegetative; I mean the cause of nourishment and growth (for such a faculty of the Soul one would assume to exist in all things that receive nourishment, even in embryos, and this the same as in the perfect creatures; for this is more likely than that it should be a different one).
Now the Excellence of this manifestly is not peculiar to the human species but common to others: for this part and this faculty is thought to work most in time of sleep, and the good and bad man are least distinguishable while asleep; whence it is a common saying that during one half of life there is no difference between the happy and the wretched; and this accords with our anticipations, for sleep is an inactivity of the soul, in so far as it is denominated good or bad, except that in some wise some of its movements find their way through the veil and so the good come to have better dreams than ordinary men. But enough of this: we must forego any further mention of the nutritive part, since it is not naturally capable of the Excellence which is peculiarly human.