Ocellus Lucanus on the Nature of the Universe: Taurus, the Platonic Philosopher, on the Eternity of the World. Julius Firmicus Maternus of the Thema Mundi. Select Theorems on the Perpetuity of Time, by Proclus

Ocellus Lucanus has written what follows concerning the Nature of the Universe; having learnt some things through clear arguments from Nature herself, but others from opinion, in conjunction with reason, it being his intention [in this work] to derive what is probable from intellectual perception.

It appears, therefore, to me, that the Universe is indestructible and unbegotten, since it always was, and always will be; for if it had a temporal beginning, it would not have always existed: thus, therefore, the universe is unbegotten and indestructible; for if some one should opine that it was once generated, he would not be able to find anything into which it can be corrupted and dissolved, since that from which it was generated would be the first part of the universe; and again, that into which it would be dissolved would be the last part of it.

But if the universe was generated, it was generated together with all things; and if it should be corrupted, it would be corrupted together with all things. This, however, is impossible. The universe, therefore, is without a beginning, and without an end; nor is it possible that it can have any other mode of subsistence.