De Defectu Oraculorum

In the first place, then, said I, the considerations that prevent our making an infinite number of worlds do not preclude our making more than one. For it is possible for God and prophecy

and Providence to exist in more worlds than one, and for the incidence of chance to be reduced to the very smallest limits, while the vast majority of things and those of the highest importance attain to genesis and transmutation in a quite orderly sequence, none of which things does infinity, by its nature, admit. Then again it is more consistent with reason that the world should not be the only-begotten of God and quite alone. For He, being consummately good, is lacking in none of the virtues, and least of all in those which concern justice and friendliness; for these are the fairest and are fitting for gods. Nor is it in the nature of God to possess anything to no purpose or for no use. Therefore there exist other gods and other worlds outside, in relation with which He exercises the social virtues. For not in relation with Himself nor with any part of Himself is there any exercise of justice or benevolence or kindness, but only in relation with others. Thus it is not likely that this world, friendless, neighbourless, and unvisited, swings back and forth in the infinite void, since we see that Nature includes individual things in classes and species, like seeds in pods and envelopes. For there is nothing in the whole list of existing things for which there is not some general designation, nor does anything that does not possess certain qualities, either in common with others or solely by itself, obtain such an appellation. Now the world is not spoken of as having qualities in common with others. It has its qualities, therefore, solely by itself, by virtue of the difference when it is compared with other things which are akin to it and similar in appearance, since it has been created with such qualities as it possesses. If in all creation such a thing as one man, one horse, one star, one god, one demigod does not exist, what is there to prevent creation from having, not one world, but more than one? For he who says that creation has but one land and one sea overlooks a matter which is perfectly plain, the doctrine of similar parts[*](); for we divide the earth into parts which bear similar names, and the sea likewise. A part of the world, however, is not a world, but something combined from the differing elements in Nature.