The hidden bargain embedded in spiritual culture runs something like this: advance far enough, purify the vessel completely enough, and the body will follow the soul into its luminosity. Disease becomes the mark of unresolved karma. Health becomes the body’s way of saying yes to the light. But Ramana Maharshi died of cancer. Ramakrishna died of cancer. Nisargadatta died of cancer. Suzuki Roshi died of cancer. Krishnamurti died of cancer. This is not a list of failures. It is a list of the most luminous human beings of the last two centuries — and their bodies, every one, remained subject to nature’s jurisdiction. What the Light Doesn’t Cure asks what realization actually transforms, if not the body’s immunity. The answer is more modest and more extraordinary than the bargain ever imagined.