People here are being quite narrow minded, give if it a chance, see it works or not. It probably won't because I cant make it work either. You can't be in a happy mood ALL the time.
The book in itself is terrible, the first part explains the secret, and then the second part is called The Secret put Simply, it's basically the same REPEATED 20 pages from the first page (even though the first part was simple enough for a baby to understand) plus some extra quotes, in fact it's about 5 pages longer somehow.
This book just repeats itself over and over, you'll only need to read the first part to understand the secret, but buying the book means you have to buy it all.
It's a waste of money, seriously. Don't bother.