The mind is so powerful. The power of the mind to influence actual physical processes in the body is why placebos actually reduce symptoms.

I read about an experiment where a hypnotized test subject was touched with an ice cube, but told it was a hot poker. The test subject actually developed a blister in the shape of where the ice cube touched the skin.

I also saw first hand a friend's worry lead to an inexplicable rash covering his entire body. When that worry was alleviated, the rash disappeared right before our eyes, like the death transformation in those old wolfman movies.

The mind is like a hot car. You have to steer it and watch how hard you push on the accelerator or else you lose control of it . . .

Trust me, I've crashed mine into a wall a time or two.