Why was staying in the Chavadi so difficult for Amir Shakkar, and what was Baba's instruction to him?

Staying in the Chavadi was a significant hardship for Amir Shakkar, primarily because the place was old, dilapidated, and extremely uncomfortable. Chapter 22 details that the Chavadi was filled with lizards and scorpions, had garbage piles, seventeen knee-deep holes, and was plagued by dampness and cold. Amir, who suffered from rheumatism, found the conditions miserable. Despite the discomfort, Sai Baba's firm instruction to him was not to worry about the external conditions, whether the place was high or low, windy, rainy, or damp. Baba's word was to be his medicine, and by accepting it, Amir was able to stay there.