From the perspective of a devotee wanting to write about their Guru, how does this act serve both the Guru and the wider community?

The act of writing a detailed poetic biography of a Guru is a profound form of service. Chapter 0 explains that a Sadguru can have his biographies written through his devotees, accepting their service in this form. By undertaking this task, the writer performs Guru service. Furthermore, when other devotees study and perform Parayans of this work, the writer gains the additional merit of public service and of serving God within humanity (Jan-Janardan). This creates a virtuous cycle where the writer's service enables a larger community to connect with the Guru's life, helping them achieve the purpose of their own lives.