As to (Aristotle's) assertion that the property of quantity is to be
both equal and unequal,[257] this property belongs to quantity itself,
and not to the objects which participate in quantity, unless it be by
accident, so far as one does not consider these objects in themselves.
A three foot object, for instance, is a quantity so far as it is taken
in its totality; but it does not form a kind with quantity itself;
only, along with it, it is traced back to a kind of unity, a common
category.