What is the primary 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 physical body. The text describes it as a supremely holy work containing the stories of His true character. It is mentioned that the inspiration for this book came after Sai Baba departed, based on the fame and profound stories He narrated with His own mouth for His disciples to hear. The chapter emphasizes that reading this life story provides enlightenment for both this world and the next.