[50] But as the writer being new in all kinds of knowledge, has [54] [55] [56] also introduced this novelty both in his accounts of domestic and of foreign matters, saying that the voice is a thing to be judged of by the sight, which in point of fact is almost the only thing in us which is not an object of sight, with the single exception of the mind; for the things which are the objects of the rest of the outward senses are, every one of them, visible to the sight, such as colours, tastes, smells, things that are hot or cold, things that are smooth or rough, things that are soft or hard, inasmuch as they are substantial bodies.