I guess can see why this book is so popular. It is 'inspirational' and 'spiritual' and I can, kind of, see how it might touch people especially if they're looking for that kind of inspiration and are of that mindset. 
 To be absolutely fair, I do not have a spiritual bone in my body. I think there is more inspiration and hope, joy and affirmation to be found in a single page of Carl Sagan than in a whole 'alternative' bookshop. I found this book to be both plodding and vapid - the latter probably part of the reason that, along with most 'spiritual' guff, people can happily apply it to themselves.