What is the spiritual significance of writing a Guru's biography, and how is this service accepted by the Sadguru?

The act of writing a Guru's biography is a very ancient and superior form of service, a tradition mentioned in the Narada Purana. As explained in Chapter 0, a Sadguru accepts service from devotees through books in two primary ways. The first is by creating profound works themselves, like Shri Dnyaneshwari. The second is by having their biographies written by devotees. This act of writing serves as a form of Guru service for the author, while also allowing other devotees to gain merit and achieve their life's purpose by studying the work and performing Parayans, or devotional readings.