"Words are our most inexhaustible source of magic."--do not appear in the book; at least not that I remember and I didn't find them when I re-read that last couple of chapters of the book.I also thought the conversation at King's Cross was better in the movie than the book and I wonder if Rowling didn't write it with the movie visuals in mind. My favorite line from the movie--
A similar line from the book (page 209): "And his knowledge is incomplete... That which Valdemort does not value, he takes no trouble to comprehend. Of house-elves and children's tales, of love, loyalty, and innoncence, Voldemort knows and understands nothing. Nothing. That they all have a power beyond his own, a power beyond the reach of any magic, is a truth he has never grasped."
Hermione Granger is another example of one whose passive reading leads to active citizenship, in particular her concern for the house elves. Q&A was dyanmic: Are Hermione's concerns due to her reading, her inherently sympathetic nature as female, or her humanity? Hermione is a muggle and one presumes attended muggle schools and knows muggle history. There are also some concerns that in the Rowling books "there is no literature--no one reads anything but text books" or books in search of information. This observation is quite disturbing, given that the Harry Potter books are credited with saving books and promoting literacy. Literacy is not necessarily literature; literature is part of what makes us human. We live a world that increasingly values "knowledge.. incomplete... takes no trouble to comprehend... children's tales... which have... power."