What specific advice did Sai Baba give Amir Shakkar regarding the hardships of the Chavadi, and how was this instruction considered the 'medicine' for his rheumatism?

Sai Baba's 'medicine' for Amir's rheumatism was not a physical substance but a profound spiritual instruction. Chapter 22 recounts Baba's firm words to him: "Wind, rain, or dampness, whether the place is high, low, or deep—do not weigh them." This command was the essence of the treatment. The healing was meant to come from complete surrender and faith, rather than from comfortable physical conditions. By instructing Amir to disregard the external hardships and accept His word as the sole remedy, Baba was testing and strengthening Amir's faith. It was this act of happily staying in the Chavadi for nine months, based purely on faith in Baba's word, that constituted the cure.