What is the purpose and origin of the book "Sai Leela" as described in Chapter 52?

According to Chapter 52, the book "Sai Leela," or Satcharitra, was written to remember the experiences Sai Baba gave to His devotees while He was in His body. It is described as a supremely holy work containing the stories of His true character, which provides enlightenment for this world and the next. The chapter reveals that Sai Baba himself chose Hemadpant, who felt he was devoid of specialized knowledge, to author the book. The inspiration for this work came after Sai departed, based on the fame and stories He had narrated with His own mouth.