What role do books and devotional reading play in fostering a community of Sai devotees?

The provided text from Chapter 0 explains that a Sadguru can accept service from devotees through books, particularly by having his biographies written by them. These biographies then serve as a focal point for the community. When devotees study and perform Parayans (devotional readings) of a detailed biography, the writer performs Guru service, and the other devotees also achieve their life's purpose. As mentioned in Chapter 0, this shared practice of studying and reading helps build a congregation of devotees and allows them to collectively serve God in humanity, thus fostering a strong community around the teachings.