From a theological standpoint, what are the two methods through which a Sadguru accepts service via books, and how does this foster community engagement?

Chapter 0 outlines two distinct ways a Sadguru accepts service from devotees through books. The first is by creating profound works themselves, like the Shri Dnyaneshwari. The second, which directly involves the community, is by having their biographies written by devotees. The Sadguru then accepts service not just from the writer, but also from the entire congregation that engages in the study and Parayans of the text. This process transforms the act of reading from a solitary pursuit into a communal service, allowing a large group of devotees to collectively honor the Guru and strengthen their shared spiritual foundation through a work like the Shri Sai Satcharita.