What is the primary message and narrative presented in Chapter 34 of the Shri Sai Satcharitra?

The primary message of Chapter 34 is the continued exploration of the glory and healing power of Sai Baba's Udi. The chapter introduces this theme and then provides a powerful narrative to illustrate it. The main story concerns a doctor from Malegaon whose nephew had an incurable bone-cyst that resisted all medical treatments. As this chapter explains, the family came to Shirdi as a last resort and pleaded with Sai Baba, who compassionately gave them Udi to apply to the wound, reassuring them of his protection and the Udi's power to uproot the disease.