What is the primary theme and story told in Chapter 34 of the Shri Sai Satcharitra?

Chapter 34 continues the narration from the previous chapter on the glory and greatness of Udi. It presents a story to illustrate Udi's power, focusing on a doctor from Malegaon whose nephew suffered from a terrible bone-cyst, also known as Hadyavran. Despite trying all native and foreign medical treatments, including surgery, the ailment remained incurable. As detailed in this chapter, the family heard about the great saint Sai Maharaj of Shirdi and decided to seek his help as a last resort, hoping his Udi could bring about a cure. Sai Baba, being the embodiment of compassion, reassured the worried parents and instructed them to apply the Udi to the wound.