This is what some of The Secret teachers say:

“It’s important to recognise that our body is really the product of our thoughts.” - John Hagelin

“You know people who have had terminal disease. Stop and think of the word, dis-ease. Hyphenate the word. That’s a body that’s not at ease.” – Bob Proctor

“The question is frequently asked when a person has manifested a disease in the body temple or some kind of discomfort in their life, “Through the power of right thinking can it be turned around?” and the answer is absolutely, “Yes.”” - Michael Beckwith

“I was hooked to a respirator and they said I’d never breathe on my own again because my diaphragm was destroyed but this little voice kept saying to me, “Breathe deep. Breathe deep.” Finally I was weened from it.” - Morris E. Goodman, The Miracle Man