The preface mentions two types of service a Sadguru takes through books. Can you elaborate on these methods?

As detailed in Chapter 0, the Sadguru accepts service from devotees through books in two distinct ways. The first is when the Sadguru creates a great work themselves, such as the Shri Dnyaneshwari or Shri Dasbodh. The second method, which is highly relevant for community building, is when the Sadguru has his biographies written by his followers. Through this second method, the Sadguru accepts service from both the writer and the broader congregation of devotees who engage with the biography through study and devotional readings, known as Parayans.