I first encountered this book three years ago, after a traumatic personal event. I had been suffering from increasing depression for several years before that. This book changed me, in a way that counselling or medication never could. First, it made me see how it was my mind, and my mind only, that was creating my own personal hell. Second, it taught me numerous practical (largely written) exercises for turning my thought patterns around. I learnt how to view life positively. And the depression lifted, overnight. Sure, it comes back sometimes, my intrinsic personality would seem to be susceptible to depression. But this book has given me 100 % confidence that I can overcome such moods. And the result is that in the last three years, I haven't suffered from depression for more than a day. As I said, a life-saver. Heartfelt thanks to the author.