What role do books and study play in fostering a community dedicated to a Sadguru like Sai Baba?

According to the preface of the Shri Sai Satcharita, a Sadguru accepts service from devotees through books in two primary ways. One is by creating great works themselves, and the second is by having their biographies written by devotees. When devotees study and perform Parayans (devotional readings) of a detailed biography, the writer performs Guru service, and the participants also achieve the purpose of their lives. This shared practice of studying a Guru's life story, as mentioned in Chapter 0, helps build and sustain a community of devotees.