I recommend the Book of Mormon as it is one of the most introspective books you can find. It comes across much clearer than many other religious books like the Bible (even though the Bible I recommend as well) because it has a common narrator who fills in the gaps for you and helps you understand the links between stories. It also is fairly scientific in its premise-- if you do an experiment by reading some of it and…
(My knowledge manager project, AGPL: http://onemodel.org )