“Since you must admit that there is nothing outside the universe, it can have no limit and is accordingly without end or measure. […] the boundary cannot stand firm anywhere, and final escape from this conclusion is precluded by the limitless possibility of running away from it.” - Lucretius (c.99-55 bc), De Rerum Natura - Book I (trans. RF Latham, Penguin, 1952, pp. 55-6). A different translation here, in part: “does compel that thou concede the all spreads everywhere, owning no confines”. And further along: “the chance for further flight prolongs forever the flight itself.”