How do written works, specifically biographies, contribute to serving a Sadguru and fostering a devotee community?

According to Chapter 0, a Sadguru takes two types of service from devotees through books. One way is by having their biographies written by devotees, and the second is through the community's engagement with these works via study and Parayans. By studying a detailed poetic biography, the writer performs Guru service. Simultaneously, when other devotees also study and perform these readings, the writer gains the merit of public service, and the other devotees also achieve the purpose of their lives. This collective engagement with a text like the Shri Sai Satcharita forms a core spiritual community activity.