Have you had a response to a book that poignantly changed your life?

I am not talking about being stirred into reflection, joy, repulsion, anger, entertainment, insight, etc…

I am asking if you have ever read a book (or anything else) that caused a stirring in you so profound that you experienced change?

There have been some questions on fluther these past couple weeks that have been reminding me of my experience with C.S. Lewis’s work Till We Have Faces a retelling of the myth of cupid and Psyche.

My response to this book forever changed my attunement to self-awareness and passion.

This is the quote going through my head lately:
“The sweetest thing in all my life has been the longing — to reach the Mountain, to find the place where all the beauty came from — my country, the place where I ought to have been born. Do you think it all meant nothing, all the longing? The longing for home? For indeed it now feels not like going, but like going back.” Spoken by the C.S. Lewis character Psyche

Is there a book or writing that has roused you towards change? Do you have a quote to share?