Can you elaborate on the concept of 'Guru service' through books and how it contributes to the broader devotee community?

According to Chapter 0, a Sadguru accepts service from devotees through books in two primary ways. The first is when the Guru creates a great work themselves. The second, more relevant to the community, is when the Guru has his biographies written by his devotees. This act of writing is a form of Guru service. The service then extends to the broader community when other devotees study and perform Parayans of these biographies. This collective study is seen as a service accepted by the Sadguru from the entire congregation of devotees, allowing them to achieve the purpose of their lives and fostering a shared spiritual connection.