The text mentions two types of service a Sadguru takes from devotees through books. How does this apply to Sai Baba and his followers?

Chapter 0 outlines that a Sadguru accepts service through books in two primary ways. The first is by creating great works themselves, and the second is by having their biographies written by devotees. For followers of Sai Baba, the second form of service is particularly relevant. The text highlights the Shri Sai Satcharita, a detailed biography written by devotee Annasaheb Dabholkar. By studying this work and performing Parayans, the congregation of devotees engages in a form of service accepted by the Sadguru, thereby strengthening their connection and community.