What book has had the most positive impact on your life?

Question:

What book has had the most positive impact on your life?

When answering the question please refain from using the "Bible". Furthmor can you give me a brief explanation why.

For me it is the "Alchemist"
This big played a role in me starting to believe in my dreams

Best Answer - Chosen by Asker: For me is was a book on Helen Keller. She overcame so much to strive for some sense of normalcy.