Where they have burned books, they will end in burning human beings.
Christian Johann Heinrich Heine (December 13, 1797 – February 17, 1856) was a journalist, an essayist, and one of the most significant German romantic poets. Jewish by birth, he converted to Christianity as an adult. (http://en.wikiquote.org/wiki/Heinrich_Heine)
This quote can be found on a entry page to People of the Book by Geraldine Brooks. Since I’ve not read the book, I’m not sure where it ties in, but I hope to find out soon.