XV. (74) And in addition to this he says, that there are three causes of death to living animals, besides the external causes which may affect them, namely, disease, old age, and want, by no one of which is the world liable to be attacked or subdued, for that it is composed of entire elements, since there is no part of them which is left out or which remains at liberty, so that any violence can be offered to it, and it also is superior to those powers from which diseases arise; and they yielding keep the world free from all disease, and free from old age, and in a state of the most perfect self-sufficiency as to all its requirements, and without need of anything, since there is nothing wanting to it which can possibly contribute to its durability, and wholly exempt from all successions and alternations of fulness and emptiness, which animals being subject to by reason of their unregulated insatiability, bring upon themselves death instead of life, or, to speak more accurately, a life which is more pitiable than any destruction. (75) Moreover, if we saw that there was no such thing as any eternal nature to be seen, those who assert the liability of the world to destruction would not appear to be so guilty of disparaging the world without any excuse, since they would have no example whatever of anything being everlasting; but since fate, according to the doctrine of those who have investigated the principles of natural philosophy most accurately, is a thing without any beginning and without any end, connecting all the causes of everything, as to leave no break and no interruption, why may we not in like manner also affirm of the nature of the world that it subsists for a great length of time, being, as it were, an arrangement of what is otherwise in no order, a harmony of what is otherwise wholly destitute of such harmony, an agreement of what is otherwise without agreement, a union of things previously separated, a condition of stocks and stones, a nature of things growing from seed and of trees, a life of all animals, the mind and reason of men, and the most perfect virtue of virtuous men? But if the nature of the world is uncreated and indestructible, then it is plain that the world is held together and powerfully preserved by an everlasting indissoluble chain. (76) But some of those who used to hold a different opinion, being overpowered by truth, have changed their doctrine; for beauty has a power which is very attractive, and the truth is beyond all things beautiful, as falsehood on the contrary is enormously ugly; therefore Boethus, and Posidonius, and Panaetius, men of great learning in the Stoic doctrines, as if seized with a sudden inspiration, abandoning all the stories about conflagrations and regeneration, have come over to the more divine doctrine of the incorruptibility of the world; (77) and it is said also that Diogenes, when he was very young, agreed entirely with those authors …