What does the quote you don't have to burn books to destroy a civilisation you just have to get people to stop reading them have to do with the book?

On contributor sites this quote is attributed variously to Ray Bradbury and/or Mark Twain. However, on academic reference sites it is attributed to Mohandas Gandhi. Follow the link below. Ray Bradbury said this in the January 1994 edition of Reader's Digest. His own website also attributes the quote to himself. I am more likely to believe it was Bradbury because he also has other quotes about similar topics, such as "There is more than one way to burn a book." (1979)