How does the Sadguru take service from his devotees through books, and is this different from the merit of Jan-Janardan?

According to Chapter 0, the Sadguru takes two types of service from devotees through books, though the text only elaborates on one in this section. The service described is that of a writer who creates a detailed poetic Guru biography. This act itself is Guru service. The merit of serving God in humanity (Jan-Janardan) is an additional benefit the writer gains when other devotees study and perform Parayans of that same book. So, the Jan-Janardan merit is a consequence of creating a work that facilitates public service and helps others achieve their life's purpose, as described in Chapter 0.