A favorite book. Besides the Bible? Hmmmm.... that's a pretty hard one. But right now, one that has really been helping me a teaching me to be a Godly young lady is Raising maidens of virtue. I read it, then picked back up and read it over again. It is very encouraging.
Oh, and for fun, I like Inkheart, Inkspell, and Inkdeath. They are very well written and draws you into the story. One of those ones you just don't want to put down, even wehen the book is done!