From the Bookshelf of Meggie & Mo's Booklist…

[close] There is a sort of busy worm,
That will the fairest book deform.
Their tasteless tooth will tear and taint
The poet, patriot, sage or saint,
Nor sparing wit nor learning.
Now, if you'd know the reason why,
The best of resons I'll spply:
'Tis bread to the poor vermin.

J. Doraston

quoted in Inkheart, chapt. 3, p. 30