“ ‘The ears of mankind, filled with these sounds, have become deaf, for of all your senses it is the most blunted. Thus, the people who live near the place where the Nile rushes down from very high mountains to the parts which are called Catadupa, are destitute of the sense of hearing, by reason of the greatness of the noise. Now this sound, which is effected by the rapid rotation of the whole system of nature, is so powerful that human hearing can not comprehend it, just as you cannot look directly upon the sun, because your sight and sense are overcome by his beams.’ ”