Whether these are separated as the parts of the body or of anything
divisible are, or are distinct by definition but by nature
inseparable, like convex and concave in the circumference of a circle,
does not affect the present question.
Of the irrational element one division seems to be widely
distributed, and vegetative in its nature, I mean that which causes
nutrition and growth; for it is this kind of power of the soul that
one must assign to all nurslings and to embryos, and this same power
to fullgrown creatures; this is more reasonable than to assign some
different power to them. Now the excellence of this seems to be common
to all species and not specifically human; for this part or faculty
seems to function most in sleep, while goodness and badness are
least manifest in sleep (whence comes the saying that the happy are
not better off than the wretched for half their lives; and this
happens naturally enough, since sleep is an inactivity of the soul
in that respect in which it is called good or bad), unless perhaps
to a small extent some of the movements actually penetrate to the
soul, and in this respect the dreams of good men are better than those
of ordinary people. Enough of this subject, however; let us leave
the nutritive faculty alone, since it has by its nature no share in
human excellence.
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