11. It may be further objected that nature, independent of all form, is
deprivation. Now deprivation is always the attribute of some hypostatic
substance, instead of itself being substance. If then evil consist in
privation, it is the attribute of the substrate deprived of form; and
on that account it could not exist by itself. If it be in the soul
that we consider evil, privation in the soul will constitute vice and
wickedness, and there will be no need to have recourse to anything
external to explain it.