
“Mediocrity in poets has never been tolerated by either men, or gods, or booksellers.”
Mediocribus esse poetis Non homines, non di, non concessere columnae.
Lines 372–373 http://books.google.com/books?id=hlgNAAAAYAAJ&q=%22mediocribus+esse+poetis+Non+homines+non+di+non+concessere+columnae%22&pg=PA769#v=onepage
Ars Poetica, or The Epistle to the Pisones (c. 18 BC)