"Thus, the motion of the orbits of the planets from east to west, having its cause in a higher heaven, is called by all violent, without, however, its doing them any injury. Moreover, they who argue thus condemn themselves, since they are compelled to admit, that not only the motion of water and air, but their very abiding places, are held by violence:—that of the latter, under fire, and that of the former, above earth."