Richard De Bury said this quote

“ [A]ll who are smitten with the love of books think cheaply of the world and wealth; as Jerome says to Vigilantius: The same man cannot love both gold and books... The hideousness of vice is greatly reprobated in books, so that he who loves to commune with books is lead to detest all manner of vice. The demon, who derives his name from knowledge, is most effectually defeated by the knowledge of books, and through books his multitudinous deceits and the endless labyrinths of his guile are laid bare to those who read... ”