The text emphasizes the ancient principle that a Sadguru is necessary for salvation. How does it connect this principle to the act of writing biographies as a form of service?

The preface in Chapter 0 begins by establishing the ancient principle that a Sadguru's grace is essential for salvation. It then connects this core belief to the tangible act of service through writing biographies. The text outlines a hierarchy of this service: writing about worldly figures is worldly and its fruit is not eternal. A higher service is writing about saints, which yields spiritual fruit. However, the highest and most certain service, as described in Chapter 0, is writing the biography of one's own Sadguru. This act, combined with devotional study like Parayans, is presented as the most direct way to perform Guru service and thereby attain the grace needed for salvation.