Why did Baba make Amir Shakkar stay in the miserable Chavadi when he was sick with rheumatism?

According to Chapter 22, Amir Shakkar, who suffered from rheumatism, was commanded by Baba to reside in the dilapidated Chavadi. This place was incredibly inhospitable, filled with pests, dampness, and filth. The text states that Baba's firm words were Amir's only "medicine." This suggests the ordeal was a profound test of faith. By accepting Baba's command as the ultimate remedy and staying there happily for nine months, Amir demonstrated his unwavering internal faith, which ensured that "everything went well" for him spiritually, despite the contrary external conditions.