What was Baba's 'medicine' for Amir's rheumatism, and how did Amir's faith play a role in his healing?

Sai Baba's medicine for Amir Shakkar's rheumatism was simply His firm word and the instruction to stay in the Chavadi for nine months. Externally, all conditions were contrary to healing—the place was damp, cold, and uncomfortable. However, as Chapter 22 highlights, Amir possessed a certain internal faith. He accepted Baba's word as the ultimate medicine and the company of Sai as the 'Great Prasad.' This unwavering faith allowed him to stay happily in the miserable conditions, and because of that internal certainty, everything went well for him.