How does Chapter 34 contrast the efficacy of conventional medicine with the spiritual power of Sai Baba's Udi?

Chapter 34 draws a sharp contrast between the limits of human knowledge and the boundless power of divine grace, as manifested through Sai Baba's Udi. The chapter meticulously lists the failures of conventional medicine: a degree-holding doctor, his expert physician friends, skilled surgeons, and all known "native and foreign treatments" were completely exhausted and helpless against the boy's bone-cyst. This established failure of medical science serves as a backdrop to highlight the simple yet profound efficacy of the Udi. Sai Baba, the embodiment of compassion, simply provides the sacred ash and a reassurance. The narrative in Chapter 34 thus posits that where all human effort and expertise fail, faith in the Guru and the power of his Udi can bring about miraculous healing, solving even incurable maladies.