THERE ARE DIFFERENCES WHICH ARE NOT QUALITIES.
There remains for us to examine if a difference of a quality never be a quality, as that of a being is not a being, nor that of a quantity, a quantity. Does five differ from three by two? No: five does not differ from three, it only exceeds it by two. How indeed could five differ from three by two, when five contains two? Likewise, a movement does not differ from a movement by a movement. As to virtue and vice, here is one whole opposed to another whole, and it is thus that the wholes are distinguished. If a distinction were drawn from the same genus, that is, from quality, instead of founding itself on another genus; as, for instance, if one said that such a vice referred to pleasures, some other to anger, some other to acquisitiveness, and if one were to admit that such a classification was good; it would evidently result that there are differences that are not qualities.