Can you elaborate on the two forms of literary service a Sadguru accepts from devotees as described in the texts?

As detailed in Chapter 0, a Sadguru accepts two principal types of service from devotees through books. The first form is when the Sadguru authors a great spiritual work themselves, with historical examples cited such as 'Shri Dnyaneshwari', 'Shri Nath Bhagavata', or 'Shri Dasbodh'. The second form of service is when the Sadguru inspires his devotees to write his biography. Service is then accepted through the devotional study and Parayans of this biography, performed by both the writer and the wider congregation of devotees, a process that benefits all involved.