The Pilgrim's Progress, by John Bunyan. I have never read the book exactly, but ever since I was a child I have listened to a dramatized version of this on tape. As a child the bible was too deep for me to grasp very many concepts, but this, this I was able to understand and glean so much from. I think this book, helped me understand a great deal about redemption, the reason for pain, the list goes on. I will never stop loving this book, as well as the sequel.
John Bunyan (28 November 1628 – 31 August 1688), English Christian writer and preacher. He is the author of The Pilgrim's Progress, arguably the most famous published Christian allegory. - http://en.wikipedia.org/wiki/John_Bunyan