If one believes in this hypothesis, then the bad things that happen to your are due to your negative thoughts. Francoise Sagan really got frosted by this idea when she contracted breast cancer. "Positive Thinking" is also a fundamental concept of Nichiren Shoshu Buddhism.

I say use what works for you, regardless of the source. Personally, I am a skeptical adherent of the scientific method, as well as an empiricist regarding my own experience with anti-depressant meds, (in which I believe).