Are the notions of virtue, and other intelligible entities by the soul
thought eternal, or does virtue arise and perish? If so, by what being,
and how will it be formed? It is the same problem that remains to be
solved. Intelligible entities must therefore be eternal and immutable,
like geometrical notions, and consequently cannot be corporeal.
Further, the subject in whom they exist must be of a nature similar to
theirs, and therefore not be corporeal; for the nature of body is not
to remain immutable, but to be in a perpetual flow.