Who was Amir Shakkar and what problem did he bring to Sai Baba?

Amir Shakkar was a devotee who approached Sai Baba seeking a cure for a chronic illness. As detailed in Chapter 22, he was afflicted with rheumatism and was suffering a great deal. He presented his case to Baba, narrating his illness in detail and praying for deliverance from his sorrow. His specific request was for a remedy to his physical ailment, which prompted Baba to give him a unique and seemingly paradoxical instruction to stay in the Chavadi.