19. Must we consider that (in the soul), the indivisible and the
divisible are identical, as if they were mingled together? Or should
we consider the distinction between the indivisible and the divisible
from some other point of view? Should the first be considered as the
higher part of the soul, and the latter as the lower, just exactly as
we say that one part of the soul is rational, and the other part is
irrational? Such questions can be answered only by a close scrutiny of
the nature of the divisibility and indivisibility of the soul.