According to Osho, the Chandogya Upanishad declares that for the true knower, where the ego has dissolved, death, disease, and sorrow have no reality. Only the 'I' dies; what is false collapses like a house of cards. When the ego-lamp is extinguished (nirvana), the moonlight of the real enters; in egoless awareness, suffering and mortality are seen as dreams, not your being.
If you stop clinging to the idea of 'me,' death, disease, and sorrow lose their grip; they don’t touch who you really are.