Creator of 'The Secret,' Rhonda Byrne and Oprah

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After that first discovery, Rhonda read hundreds of books, listened to hundreds of hours of audio tapes and scoured the Internet for more information. She says she traced the idea of The Secret through history—all the way from 3500 B.C. to the present day. "Since I discovered The Secret, every single moment of my entire life has changed, and I am living my life for the first time," Rhonda says.

Rhonda defines The Secret as the law of attraction, which is the principle that "like attracts like." Rhonda calls it "the most powerful law in the universe," and says it is working all the time. "What we do is we attract into our lives the things we want, and that is based on what we're thinking and feeling," Rhonda says. The principle explains that we create our own circumstances by the choices we make in life. And the choices we make are fueled by our thoughts—which means our thoughts are the most powerful things we have here on earth.