How can devotees engage in service to their Sadguru through literary works?

According to the preface in Chapter 0, a Sadguru accepts service from devotees through books in two primary ways. The first is when the Guru themselves creates a great work, and the second is when they inspire devotees to write their biographies. These biographies, such as the Shri Sai Satcharita, then become a medium for service. The writer performs Guru service by creating the text, and the wider congregation of devotees performs service by engaging in its study and performing Parayans. This collective participation is a significant form of devotion and service.