Every now and then, there's a book that comes out by a no-name (typically a female author who just happens to be a mother and suffered from some sort of ailment/adversity), and it relays a tale about metaphysical powers which can make a regular person "great," and then they'll relay some names of the greatest human beings who ever lived, ala Leonardo da Vinci, who apparently knew of this power.
But the only thing that really unites these authors (other than this apparent "mother with adversity" criteria) is how much money they've made off of making unsubstantiated claims about quantum physics supporting their philosophy.
Before "The Secret," there was a book (or I should say, a whole marketing scheme, including certifying official instructors in a one-day, three-hour course) called "ThetaHealing," which similarly relayed claims about metaphysical energy, quantum mechanics, and curing cancer.
If it was Gandhi, Benjamin Franklin, da Vinci, or another super-successful "great person" who had written these books, then at least there would be some credibility attached to it. But the fact that these are people who were nobodies before writing these books kind of makes it hard to take them seriously as philosophers about how life works.