The cosmos itself must of necessity be indestructible and uncreated. Indestructible because, suppose it destroyed: the only possibility is to make one better than this or worse or the same or a chaos. If worse, the power which out of the better makes the worse must be bad. If better, the maker who did not make the better at first must be imperfect in power. If the same, there will be no use in making it; if a chaos... it is impious even to hear such a thing suggested. These reasons would suffice to show that the world is also uncreated: for if not destroyed, neither is it created. Everything that is created is subject to destruction.

VII. On the Nature of the World and its Eternity. - On the Gods and the Cosmos