In 1991 I had a life-changing experience when I was able to cure myself of influenza in a two-hour period by imagining I was the karate fighter I was watching on the televised tournament. I have never been able to replicate that experience. The reason is that on that night I became someone else, someone who was the picture of health. The mind of the karate fighter was able to mobilize a powerful immune response. Trying to make it happen does not work. To make it work, you must not try—you must truly believe.