This book is incredible. As I approached the end, in fact, I was amazed that only one person wrote it and that she wasn't 100 years old. The wisdom and the clarity with which Farhi writes is a true gift to take in. As a yoga teacher, I think this book is a must for all who take on this role.
Farhi makes highly-anecdotal references about practice and the whole process of finding one's path through dedication. She published this in 2004 so it's really a tapestry of modern insights on a tradition that dates back thousands of years.
Indeed, she shares parts of her own path that comfort and assure the reader. The only caveat to this raving review would be: If you are facing demons, engaging in destructive behaviors or dealing with emotional issues, this is truly the book, but be fully prepared to let it change you because it likely will (especially at that 'seed in the consciousness level' on patches of thought you will do best to water).