Based on the story of the doctor's nephew, what does Chapter 34 teach us about the power of Udi?

Chapter 34 uses the story of the doctor's nephew to illustrate the profound power and glory of Sai Baba's Udi, especially in situations where conventional remedies fail. The chapter explicitly states that a "terrible disease like a bone-cyst (Hadyavran) could not be cured by any remedy," yet smearing Udi from Sai's hand could uproot the pain. The narrative emphasizes that expert surgeons felt helpless, but the family heard that if the great saint applied Udi, "even incurable diseases perish." By having Sai Baba give the Udi to the family and instruct them to apply it to the wound, the chapter presents Udi as a divine remedy that transcends the limits of medical science.