The texts mention 'unwavering devotion' as key to service. Why is writing a poetic biography of one's Sadguru considered a superior form of this service compared to other types of writing?

According to the preface in Chapter 0, writing about worldly figures or even multiple saints is a limited service, often rooted in self-interest and not yielding eternal spiritual fruits. The most certain path to salvation through writing is to focus on the biography of one's own Sadguru. This practice should be undertaken with 'unwavering devotion.' Furthermore, the text explains that detailed poetic biographies are most suitable for study, recitation, Parayan, and Saptah. This is because poetry is memorized more easily than prose and stays in the memory, making it a more effective vehicle for Guru service and continuous spiritual reflection.