It's self-signed... Even if the idea isn't completely original, I would assume the writing is.
Or if you're doubting the factual evidence behind it, I don't think he's presenting this as fact, despite his tone. This is the same tone of many self-help books, even those backed by "real" evidence and data who cite sources. Still doesn't mean they work for everyone.
Or if you're doubting the factual evidence behind it, I don't think he's presenting this as fact, despite his tone. This is the same tone of many self-help books, even those backed by "real" evidence and data who cite sources. Still doesn't mean they work for everyone.
If you disagree, then don't take his advice.