17. Qualities, therefore, should be classified as of the body, and of
the soul.[406] Even though all the souls, as well as their immaterial
qualities, be considered as existing on high, yet their inferior
qualities must be divided according to the senses, referring these
qualities either to sight, hearing, feeling, taste, or smell. Under
sight, we will classify the differences of colors; under hearing,
that of the sounds; and likewise, with the other senses. As to the
sounds, inasmuch as they have but a single quality, they will have to
be classified according to their being soft, harsh, agreeable, and the
like.