In what way does a Sadguru accept service through books, and how can a "congregation of devotees" participate in this service to build a community?

Chapter 0 explains that a Sadguru accepts two types of service through books. The second type involves having his biographies written by devotees. The service is then fulfilled by both the writer and the larger "congregation of devotees" who engage with the text. This congregation participates by studying the biography and performing Parayans, or devotional readings. This collective act of study is how a community is built, as devotees come together to serve the Guru and, in doing so, also achieve the purpose of their own lives and perform a public service to "God in humanity (Jan-Janardan)."