How did Amir Shakkar manage to endure his nine-month stay in the miserable Chavadi despite his rheumatism?

Amir Shakkar endured his nine-month ordeal in the Chavadi through his profound and certain faith in Sai Baba. Chapter 22 explains that although he was suffering from rheumatism and the external conditions were completely contrary to his health—with dampness, cold, and filth—his internal state was one of complete trust. He accepted Baba's word as his true medicine and the difficult stay as a 'Great Prasad'. Baba's firm instruction was not to worry about the conditions, and by adhering to this, Amir stayed happily. This demonstrates that his unwavering faith was the key to overcoming the immense physical hardship.