What was the 'medicine' Sai Baba gave to Amir Shakkar for his rheumatism, and why was it effective?

The 'medicine' Sai Baba prescribed for Amir Shakkar's rheumatism was not a physical substance but His word alone. As explained in Chapter 22, Baba gave Amir the firm instruction to stay in the Chavadi and not to question the harsh conditions of the place, whether it be wind, rain, or dampness. The remedy's effectiveness was entirely dependent on Amir's faith. Despite the external conditions being completely contrary to healing, Amir's internal and certain faith in Baba's command was absolute. He accepted Baba's word as the ultimate medicine and stayed there for nine months, which led to his cure.