How can devotees engage in service to a Sadguru and his teachings through literary works?

According to the preface in Chapter 0, a Sadguru accepts two primary forms of service from devotees through books. The first is when a Guru has their biographies written by followers. Devotees can then perform service by studying these biographies and conducting Parayans, which are devotional readings. This act of study and shared reading serves both the writer and the congregation of devotees, as it helps them achieve the purpose of their lives. This creates a powerful method for engaging with and serving the Guru's legacy through a community of practice.