How is the act of writing a Guru's biography considered a form of service, and who are the beneficiaries?

Writing a Guru's biography is a multifaceted form of service with multiple beneficiaries. The preface in Chapter 0 explains that, first and foremost, the writer performs a direct service to their Guru. Secondly, the Sadguru accepts this service from the devotee. Finally, the wider community of devotees benefits; when they study and perform Parayans of the biography, they work towards achieving their life's purpose. This, in turn, grants the writer the merit of serving 'God in humanity' (Jan-Janardan) and performing public service, creating a virtuous cycle of devotion and spiritual gain for all involved.