What is the central message conveyed in Chapter 34 of the Shri Sai Satcharitra regarding Sai Baba's power?

Chapter 34 primarily illustrates the profound healing power of Sai Baba, specifically through his Udi. The chapter continues the narration on the glory of Udi by presenting a detailed account of a doctor's nephew from Malegaon who suffered from an incurable bone-cyst, or Hadyavran. Despite the efforts of many expert physicians and surgeons, the boy's condition did not improve. As detailed in this chapter, the family, having exhausted all medical remedies, turned to Sai Baba as a last resort. Baba reassured the distressed family, gave them Udi to apply to the wound, and promised a cure. This story serves as a powerful testament to the idea that faith in the Sadguru and his Udi can overcome even the most impossible ailments.