Why was the 'Sai Leela' book written, and how was Hemadpant chosen for this task?

The book, referred to as "Sai Leela," was written primarily to remember and preserve the experiences that Sai Baba gave to His devotees while He was in His physical body. As Chapter 52 explains, it is considered a supremely holy text. For the task of writing this true life story, Sai Baba chose Hemadpant. It is specifically mentioned that Hemadpant was devoid of specialized knowledge and learning, yet Sai held his hand and caused the book to be written, with further inspiration for it coming after Sai's departure.