How can devotees engage in service to their Guru through literary works and community practices?

According to the preface in Chapter 0, a Sadguru accepts two primary forms of service from devotees through books. The first is when the Guru creates a great work themselves. The second, more communal method, is when the Guru has biographies written by their devotees. This allows the writer to perform Guru service, while also creating an opportunity for other devotees to study and perform 'Parayans' or 'Saptahs' (devotional readings). Through this shared practice, the writer gains the merit of serving God in humanity, and the participating devotees also progress toward achieving the purpose of their lives.