It is usually when the body is convinced that it has been given the conditions under which it must be all right; it takes the resolution that it must be all right and it is cured. But if your body has not the will, the resolution to get cured, you may try whatever you like, it won’t be cured. This also I know by experience. For I knew people who could be cured in five minutes, even of a disease considered very serious, and I knew people who had no fatal illness, but cherished it with such persistence that it did become fatal. It was impossible to persuade their body to let go their illness.
Ref: Questions and Answers 1953