What are the two ways a Sadguru accepts service from devotees through literary works?

As detailed in Chapter 0, a Sadguru accepts service from devotees through books in two distinct forms. The first type of service is when the Guru creates great works themselves, with 'Shri Dnyaneshwari' and 'Shri Dasbodh' cited as examples. The second form of service, which involves the devotees more directly, is when the Sadguru has their biographies written by their followers. The service is then rendered by the writer who creates the text and, importantly, by the entire congregation of devotees who engage in the study and performance of Parayans of that biography. This collective engagement is a key way devotees can serve.