According to the text, how does a Sadguru accept service from devotees through literary works?

The source material from Chapter 0 explains that a Sadguru accepts service from devotees through books in two distinct ways. The first method is when the Sadguru creates profound spiritual works themselves, with examples given such as Shri Dnyaneshwari or Shri Dasbodh. The second method involves the Sadguru inspiring devotees to write their biographies. In this form of service, the writer performs Guru service through the act of writing, and the wider congregation of devotees offers service by engaging in the study and Parayans of these biographical texts, thereby fulfilling the purpose of their lives.