Also, even though I am not really a religious person, I find it odd that in 100 comments, no one has mentioned the Bible (or any holy book that I could see). So, given that I have read it, and that it was inspiring in many ways, here you go:

The Bible


- Jason Slover, just someone in a forum discussion about books that inspired you. 
( many people see the bible only as a moral guidance, inspiring books, but miss out the divinity aspect of it)