Based on the preface, can you explain the roles of authors and devotees in creating and using sacred texts about a Guru?

Chapter 0 describes a symbiotic relationship between a Guru, devotee-authors, and the wider community of followers. A Sadguru can inspire devotees to write prose and poetic biographies in various languages, leaving the world indebted to them. By writing a detailed biography, the author performs a vital Guru service. As Chapter 0 further elaborates, when other devotees study and perform Parayans of this work, the writer gains the merit of serving God in humanity (Jan-Janardan) and public service. This process allows the entire congregation of devotees to engage in service and achieve their life's purpose through the study of these texts.