What is considered the most effective form of Guru service through writing, and what qualities are essential for it?

According to the preface in Chapter 0, the best and most certain form of Guru service through writing is to compose the biography of one's own Sadguru. This should be undertaken either by the Guru's direct command or through a powerful inner inspiration. The text emphasizes that this service requires specific inner qualities, including a firm resolve, a pure heart, excellent faith, selfless love, and unwavering devotion. Furthermore, this service extends beyond just writing; it involves personally studying the biography regularly, performing hundreds of readings known as Parayans, and conducting weekly recitations called Saptahs. This form of service is considered a profound path that does not interfere with family life.