The preface mentions two types of service a Sadguru takes through books. Can you explain these and how they relate to creating a community of devotees?

According to Chapter 0, a Sadguru can take two forms of service from devotees through literary works. The first is when the Guru creates a great work themselves, like Shri Dnyaneshwari. The second, which is key to community building, is when the Guru has his biography written by devotees. This act serves a dual purpose: the writer performs Guru service through the act of writing, and the wider community of devotees performs service through the study and devotional reading (Parayans) of that biography. Chapter 0 emphasizes that when many devotees study such a work, the writer earns merit for public service, and the readers are guided toward the purpose of their lives, strengthening the community's spiritual bonds.