This is my game changer read, excited to see it here. Everything from dealing with my father's death to that black emptiness I've fought my entire life, I've read this book a few times now. It has a lot in common with Cognitive Therapy but doesn't require filling out mood journals (does anybody actually manage to do that?)

It serves as an excellent intro to Seneca's Letter's from a Stoic, which is another great book to revisit over the years.

There are some samples from the book available on Boing Boing (http://boingboing.net/author/william_b_irvine).