How can a devotee serve their Guru through books, and what are the benefits of this practice according to the preface?

The preface explains that a Sadguru accepts service from devotees through books when they inspire devotees to write their biographies. As detailed in chapter 0, when a devotee writes a detailed poetic biography of their Guru, they perform a direct service. Furthermore, when other devotees study this work and perform Parayans (devotional readings), the original writer gains the merit of serving God in humanity (Jan-Janardan) and performing public service. The text also states that these other devotees, by engaging in such study, also achieve the purpose of their lives, making it a mutually beneficial spiritual practice.