How is the act of reading a Guru's biography, like the Shri Sai Satcharita, considered a form of service?

Reading a Guru's biography is presented as a significant form of service. Chapter 0 explains that a Sadguru takes two types of service from devotees through books. One way is by having his biographies written by devotees, and the second is by accepting service in the form of study and Parayans from both the writer and the congregation. When devotees study and perform Parayans of a work like the Shri Sai Satcharita, they are actively participating in this service, which in turn helps them achieve the purpose of their lives and deepens their connection with the Guru.