What is the primary message conveyed through the story of the bone-cyst in Chapter 34?

The primary message conveyed in Chapter 34, through the story of the boy with the bone-cyst, is the immense healing power of Sai Baba's Udi and the necessity of unwavering faith. The chapter itself states its purpose is to continue describing the "glory of Udi." The story serves as a potent illustration of this glory. It details a situation where all medical expertise, including that of a degree-holding doctor and expert surgeons, proved futile against a "most difficult and extraordinary malady." As Chapter 34 narrates, it was only when the desperate family sought refuge in Sai Baba with total devotion that they found a solution. Baba's simple instruction to apply the Udi underscores that faith in the Guru can overcome seemingly insurmountable obstacles.