What are the two types of service a Sadguru takes from devotees through books, and which one applies to the Shri Sai Satcharita?

Chapter 0 describes two forms of service a Sadguru takes from devotees through literary works. The first is when the Sadguru creates great works himself, with Shri Dnyaneshwari and Shri Dasbodh given as examples. The second type of service, which directly applies to the Shri Sai Satcharita, is when the Sadguru has his biographies written by his devotees. The service is then rendered by both the writer and the wider community of devotees who engage in study and devotional readings, or Parayans, of that biography. Therefore, the writing of the Shri Sai Satcharita by Annasaheb Dabholkar and its subsequent study by the congregation of devotees is a perfect example of this second form of service.