"How to Stop Worrying and Start Living" this book can be life-changing. The book takes the incessant problem of worry, head on. It says that of all the liars in the world most of the time it's our own fears and worries. Worry doesn't take away your troubles but it do take away your peace, that's the main message of the book. He starts very scientifically by searching the causes behind the worry, by taking many case studies. The advice given in the book are really helpful. Its a classic book that must be read if you are in depression and want to come out of it.