[109] for as the seasons of the year, in their proper alternations of revolutions, go through their regular cycle, completing their periodical changes without any cessation; in the same manner suppose that the elements of the world in the course of their continual interchanges with one another (though it is a most paradoxical assertion), when they appear to be perishing are in reality being made immortal, passing over the same course again and again, so as to have their existence infinitely protracted.