What role do books and scriptures play in serving Sai Baba and building a community of devotees?

According to the preface in Chapter 0, a Sadguru accepts service from devotees through books in two primary ways. The first is by creating great works themselves, and the second is by having their biographies written by devotees. These biographies, like the Shri Sai Satcharita, are then used for study and devotional readings, known as Parayans, by the congregation. This shared practice is a form of service to the Guru and also helps devotees achieve the purpose of their lives, thereby strengthening the community around the teachings.