How can the simple act of reading a book like the Shri Sai Satcharita be considered a form of 'service' to the Guru?

The preface, as outlined in Chapter 0, explains that a Sadguru accepts two types of service from devotees through books. The first is the author's service in writing the biography. The second, as mentioned in Chapter 0, is the service accepted from the congregation of devotees through their dedicated study and performance of Parayans of that biography. Therefore, when devotees collectively engage with a text like the Shri Sai Satcharita, they are not merely reading; they are actively participating in a recognized form of devotional service that the Sadguru accepts, which in turn helps them progress spiritually.