What was Amir Shakkar's mindset that allowed him to endure the hardships of the Chavadi?

Chapter 22 explains that while the external conditions in the Chavadi were completely contrary to comfort and health, Amir Shakkar possessed a certain internal faith that made everything go well. He accepted Sai Baba's word as the ultimate medicine. The text states that he viewed the company of Sai as the 'Great Prasad' and, because of this unwavering faith, he stayed there happily for the ordained nine months. His internal conviction and trust in Baba's instruction overrode the extreme physical discomfort of his surroundings.