On the Beginning of the World, and Its Causes
Now let us see what can be said in answer to those who make these assertions. For it will appear to be a necessary consequence that, if bodily nature be annihilated, it must be again restored and created; since it seems a possible thing that rational natures, from whom the faculty of free-will is never taken away, may be again subjected to movements of some kind, through the special act of the Lord Himself, lest perhaps, if they were always to occupy a condition that was unchangeable, they should be ignorant that it is by the grace of God and not by their own merit that they have been placed in that final state of happiness; and these movements will undoubtedly again be attended by variety and diversity of bodies, by which the world is always adorned; nor will it ever be composed (of anything) save of variety and diversity—an effect which cannot be produced without a bodily matter.
4. And now I do not understand by what proofs they can maintain their position, who assert that worlds sometimes come into existence which are not dissimilar to each other, but in all respects equal. For if there is said to be a world similar in all respects (to the present), then it will come to pass that Adam and Eve will do the same things which they did before: there will be a second time the same deluge, and the same Moses will again lead a nation numbering nearly six hundred thousand out of Egypt; Judas will also a second time betray the Lord; Paul will a second time keep the garments of those who stoned Stephen; and everything which has been done in this life will be said to be repeated—a state of things which I think cannot be established by any reasoning, if souls are actuated by freedom of will, and maintain either their advance or retrogression according to the power of their will. For souls are not driven on in a cycle which returns after many ages to the same round, so as either to do or desire this or that; but at whatever point the freedom of their own will aims, there do they direct the course of their actions. For what these persons say is much the same as if one were to assert that if a medimnus of grain were to be poured out on the ground, the fall of the grain would be on the second occasion identically the same as on the first, so that every individual grain would lie for the second time close beside that grain where it had been thrown before, and so the medimnus would be scattered in the same order, and with the same marks as formerly; which certainly is an impossible result with the countless grains of a medimnus, even if they were to be poured out without ceasing for many ages. So therefore it seems to me impossible for a world to be restored for the second time, with the same order and with the same amount of births, and deaths, and actions; but that a diversity of worlds may exist with changes of no unimportant kind, so that the state of another world may be for some unmistakeable reasons better (than this), and for others worse, and for others again intermediate. But what may be the number or measure of this I confess myself ignorant, although, if any one can tell it, I would gladly learn.
5. But this world, which is itself called an age, is said to be the conclusion of many ages. Now the holy apostle teaches that in that age which preceded this, Christ did not suffer, nor even in the age which preceded that again; and I know not that I am able to enumerate the number of anterior ages in which He did not suffer. I will show, however, from what statements of Paul I have arrived at this understanding. He says, “But now once in the consummation of ages, He was manifested to take away sin by the sacrifice of Himself.” For He says that He was once made a victim, and in the consummation of ages was manifested to take away sin. Now that after this age, which is said to be formed for the consummation of other ages, there will be other ages again to follow, we have clearly learned from Paul himself, who says, “That in the ages to come He might show the exceeding riches of His grace in His kindness towards us.” He has not said, “in the age to come,” nor “in the two ages to come,” whence I infer that by his language many ages are indicated. Now if there is something greater than ages, so that among created beings certain ages may be understood, but among other beings which exceed and surpass visible creatures, (ages still greater) (which perhaps will be the case at the restitution of all things, when the whole universe will come to a perfect termination), perhaps that period in which the consummation of all things will take place is to be understood as something more than an age. But here the authority of holy Scripture moves me, which says, “For an age and more.” Now this word “more” undoubtedly means something greater than an age; and see if that expression of the Saviour, “I will that where I am, these also may be with Me; and as I and You are one, these also may be one in Us,” may not seem to convey something more than an age and ages, perhaps even more than ages of ages—that period, viz., when all things are now no longer in an age, but when God is in all.
Source: De Principiis (New Advent)