Based on the provided text, what is the core message of Chapter 34?

The core message of Chapter 34 is the supreme and divine healing power of Sai Baba's Udi, especially in cases deemed hopeless by conventional means. The chapter emphasizes that when all human efforts, including those of expert doctors and surgeons, are exhausted, complete faith and surrender to a Sadguru like Sai Baba can provide a solution. This is demonstrated through the story of the doctor's nephew, whose incurable bone-cyst was healed by simply smearing Udi given by Baba. As Chapter 34 narrates, this event underscores that Udi is not merely ash but a vessel of Baba's grace and power, capable of averting great calamities.