How can devotees offer service to Sai Baba through his teachings and life story?

According to the preface in Chapter 0, a Sadguru accepts service from devotees in two primary ways involving books. The first is by writing great works themselves, and the second is by having their biographies written by devotees. These biographies then become a medium for service through study and devotional readings, known as Parayans. Therefore, by studying a detailed biography like the Shri Sai Satcharita, both the original writer and the congregation of devotees are performing a valuable service to the Guru.