Simon R. Green said this quote

I finally found my way to the Really Restricted Section, where they keep the kind of books most scholars aren't even supposed to know exist. I knocked on the closed door, said the proper passwords, and the door opened before me. I walked in, and the ghost of the Head Librarian, a thin, dusty presence, with dark eyes and a disapproving look, appeared before me, blocking my way. (He had been eaten by a book, then brought back by the other books, apparently because they approved of him. Because even though he didn't have much time for people, he loved books.)