5
And yet another point: privation of any sort is something simple and uncomplicated, whereas substances have many differences and powers. Silence, for example, is of only one kind, while sound varies, sometimes annoying, at other times delighting, the perception. Both colours and figures show the same variation, for they produce different effects on different occasions when they meet the eye; but that which cannot be touched and is without colour or any quality whatever, admits no difference, but is always the same.