Librarian - magic books

Some people like to settle down with a good book. No-one in possession of a complete set of marbles would like to settle down with a book of magic, because even the individual words have a private and vindictive life of their own and reading them, in short, is a kind of mental Indian wrestling. Many a young wizard has tried to read a grimoire that is too strong for him, and people
who’ve heard the screams have found only his pointy shoes with the classic wisp of smoke coming out of them and a book which is, perhaps, just a little fatter. Things can happen to browsers in magical libraries that make having your face pulled off by tentacled monstrosities from the Dungeon Dimensions seem a mere light massage by comparison.

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Mort p113-114