To the objection that the human soul must decompose because she
contains three parts, it may be answered that, when souls issue from
here below, those that are purified leave what had been added to them
in generation (the irrational soul,[93]) while the other non-purified
souls do free themselves therefrom with time. Besides, this lower
part of the soul does not itself perish, for it exists as long as
the principle from which it proceeds. Indeed, nothing that exists is
annihilated.