To begin with (if we consider the related One from this point of view),
it will seem astonishing to see the cause numbered along with the
effects. It would indeed be unreasonable to cram into a single genus
both superior and inferior things. If nevertheless, on counting the one
amidst the essences of which He is the cause, He was to be considered
as a genus to which the other essences were to be subordinated,
and from which they differed; if, besides, the one was not to be
predicated of the other essences either as genus, or in any other
respect, it would still be necessary that the genera which possessed
essence subsume species under them; since, for instance, by moving,
you produce walking, and yet walking cannot be considered a genus
subordinate to you; but above the walking there existed nothing else
that could, in respect to it, operate as a genus; and if nevertheless
there existed things beneath walking, walking would, in respect to
them, be a genus of the essences.