QUALITIES ARE ACTS OF BEING, PROCEEDING FROM REASONS AND ESSENTIAL POTENTIALITIES.
What we call a complement of being should not be termed a quality, because they are actualizations of being, actualizations which proceed from the reasons and the essential potentialities. Qualities are therefore something outside of being; something which does not at times seem to be, and at other times does not seem not to be qualities; something which adds to being something that is not necessary; for example, virtues and vices, ugliness and beauty, health, and individual resemblance. Though triangle, and tetragon, each considered by itself, are not qualities; yet being "transformed into triangular appearance" is a quality; it is not therefore triangularity, but triangular formation, which is a quality. The same could be said of the arts and professions. Consequently, quality is a disposition, either adventitious or original, in already existing beings. Without it, however, being would exist just as much. It might be said that quality is either mutable or immutable; for it forms two kinds, according to whether it be permanent or changeable.