Why was Amir Shakkar's stay in the Chavadi so difficult, and what was Baba's instruction to him during this time?

Amir Shakkar's stay in the Chavadi was exceptionally challenging because the building was old, dilapidated, and unsanitary. Chapter 22 details that it was inhabited by lizards, scorpions, and even lepers, with garbage and knee-deep holes making it miserable. Despite Amir suffering from rheumatism, Baba instructed him to reside there. Baba's firm words served as his only 'medicine,' advising him not to weigh the difficult conditions, whether it be wind, rain, dampness, or the uneven ground. Accepting Baba's word with faith, Amir viewed the proximity to Sai as the 'Great Prasad,' which helped him endure the physical hardship.