Motivational books?

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If you want to go down that route, I would start with "Darkness Visible" by William Styron.  Not only does it tell an interesting experience, he's quite the writer, too.

I second this recommendation. I read Darkness Visible shortly after its publication and in the midst of a pretty serious bout of depression and found Styron's account of his own, critically serious, depression oddly comforting.

But don't stop there. I recommend all of Styron's books. He was not only a fine writer but a courageous artist, willing to tackle some of the most troubling and painful subjects imaginable.