10. But Epicurus, stooping towards me, says, "You have - 199 - measured one world, my friend; there are many and endless worlds ¹²." I am compelled then again to speak of many heavens, other aethers, and many of them. Come then, without more delay, having victualled yourself for a few days' travel into the worlds of Epicurus. I easily pass its bounds, Tethys and Oceanus. But when I have entered into a new world, and as it were into a new city, I measure the whole in a few days. And from thence I cross back into the world again, then into a fourth, and a fifth, and a tenth, and an hundredth, and a thousandth, and where will it end ? For all things already are the darkness of ignorance to me, and black error, and endless wandering, and unprofitable fancy, and ignorance not to be comprehended: unless else I intend to number the very atoms also, out of which such great worlds have arisen, that I may leave nothing unexamined, especially of things so necessary and useful, from which both houses and cities prosper. These things have I gone through, wishing to point out the opposition which is in their doctrines, and how their examination of things will go on to infinity and no limit, for their end is inexplicable and useless, being confirmed neither by one manifest fact, nor by one sound argument.

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