You tell us that Democritus says that there are a countless number 

 of worlds, and that there are some which are not only so like one 

 another, but so completely and absolutely equal in every point, that 

 there is no difference whatever between them, and that they are 

 quite innumerable ; and so also are men. 



CICERO, Academic Questions. 



The idea that there is but a single world in all infinitude would 

 be as absurd as to suppose that a vast field had been formed to 

 produce a single blade of wheat. 



METRODORUS, 3rd C. B.C. (De Placitis). 



