What is the significance of writing a Guru's biography, and how does it serve the community?

Chapter 0 elaborates on the profound service of writing a Guru's biography. The Sadguru accepts service from devotees in two ways through books: either by creating a great work themselves or by having their biographies written. When a devotee writes a detailed biography, like Annasaheb Dabholkar did with the Shri Sai Satcharita for Sai Baba, they are performing Guru service. Furthermore, when other devotees study and perform Parayans of this work, the writer gains the merit of serving God in humanity (Jan-Janardan) and public service, thus strengthening the entire spiritual community.