Lucretius Book One:
[511] Moreover, since there is void in things created, solid matter must needs stand all round, nor can anything by true reasoning be shown to hide void in its body and hold it within, except you grant that what keeps it in is solid. Now it can be nothing but a union of matter, which could keep in the void in things. Matter then, which exists with solid body, can be everlasting, when all else is dissolved.
[520] Next, if there were nothing which was empty and void, the whole would be solid; unless on the other hand there were bodies determined, to fill all the places that they held, the whole universe would be but empty void space. Body, then, we may be sure, is marked off from void turn and turn about, since there is neither a world utterly full nor yet quite empty. There are therefore bodies determined, such as can mark off void space from what is full. These cannot be broken up when hit by blows from without, nor again can they be pierced to the heart and undone, nor by any other way can they be assailed and made to totter; all of which I have above shown to you but a little while before. For it is clear that nothing could be crushed in without void, or broken or cleft in twain by cutting, nor admit moisture nor likewise spreading cold or piercing flame, whereby all things are brought to their end. And the more each thing keeps void within it, the more is it assailed to the heart by these things and begins to totter. Therefore, if the first bodies are solid and free from void, as I have shown, they must be everlasting.
[540] Moreover, if matter had not been everlasting, ere this all things had wholly passed away to nothing, and all that we see had been born again from nothing. But since I have shown above that nothing can be created from nothing, nor can what has been begotten be summoned back to nothing, the first-beginnings must needs be of immortal body, into which at their last day all things can be dissolved, that there may be matter enough for renewing things. Therefore the first-beginnings are of solid singleness, nor in any other way can they be preserved through the ages from infinite time now gone and renew things.
