Could you elaborate on the two ways a Sadguru accepts service from devotees through books, and how this fosters a community?

Chapter 0 outlines two methods through which a Sadguru accepts service via literary works. The first is when the Sadguru creates great works himself, like 'Shri Dnyaneshwari'. The second, more relevant to community building, is when the Sadguru has his biographies written by devotees. Service is then accepted through the study and Parayans of these biographies by both the writer and the wider congregation of devotees. This shared act of study and devotion, as mentioned in chapter 0, unites the community, allowing them to collectively serve the Guru and achieve the purpose of their lives.