All these things participate in a being; they do not differ from it,
they are identical with it, and constitute it. For if evil be an
accident in something, then evil, though not being a real being, must
be something by itself. Just as, for the good, there is the Good in
itself, and the good considered as an attribute of a foreign subject,
likewise, for evil, one may distinguish Evil in itself, and evil as
accident.