What was Amir's sickness, and how did Baba 'treat' him by making him stay in the Chavadi?

Amir Shakkar was suffering from rheumatism, a condition that causes joint pain and is worsened by cold and damp environments. Paradoxically, Baba instructed him to stay in the Chavadi, a place described in Chapter 22 as being full of dampness, wind, and cold. Baba's 'treatment' was not physical medicine but His word. He firmly told Amir not to be concerned with the adverse conditions. Amir's healing came from his complete faith; by accepting Baba's word as his medicine, his internal certainty overcame the external hardships, and he successfully completed his nine-month stay as ordained.