How does the story of the doctor from Malegaon illustrate the spiritual power of Udi?

Chapter 34 uses the story of the Malegaon doctor's nephew to powerfully illustrate the glory and spiritual efficacy of Sai Baba's Udi. The narrative deliberately establishes the problem's severity: a bone-cyst that was deemed incurable by a host of medical experts, including the boy's own physician uncle. By detailing the failure of all conventional treatments—native, foreign, and surgical—the chapter creates a stark contrast. It shows human knowledge and skill reaching their absolute limit. It is precisely at this point of complete helplessness that Sai Baba's Udi is introduced. His simple instruction to smear the Udi on the wound, as recounted in Chapter 34, frames the sacred ash not merely as an alternative medicine but as a divine intervention that transcends the limitations of worldly remedies.