Enneads VI.1: Of the Ten Aristotelian and Four Stoic Categories
Ugly Qualities Are Imperfect Reasons
If quality consist in a form, in a character and a reason, how could one thus explain impotence and ugliness? We shall have to do so by imperfect reasons, as is generally recognized in the case of ugliness. But how can a “reason” be said to explain sickness? It contains the reason of health, but somewhat altered. Besides, it is not necessary to reduce everything to a reason; it is sufficient to recognize, as common characteristic, a certain disposition foreign to being, such that what is added to being be a quality of the subject. Triangularity is a quality of the subject in which it is located, not by virtue of its triangularity, but of its location in this subject, and of enduing it with its form. Humanity has also given to man his shape, or rather, his being.
THERE IS ONLY ONE KIND OF QUALITY; OF WHICH CAPACITY AND DISPOSITION PARTAKE.
11If this be so, why should we recognize several kinds of qualities? Why should we distinguish capacity and disposition? Whether quality be durable or not, it is always the same; for any kind of a disposition is sufficient to constitute a quality; permanence, however, is only an accident, unless it should be held that simple dispositions are imperfect forms, and that capacities are perfect forms. But if these forms be imperfect, they are not qualities; if they be already qualities, permanence is but an accident.