What is described as the most effective method of serving a Guru through writing?

The preface, presented in Chapter 0, identifies the best and most certain written service for attaining salvation as the act of writing the biography of one's own Sadguru. This should be undertaken either by the Guru's direct command or through a strong inner inspiration. Furthermore, the service is not merely writing; it involves a continuous commitment to personally study the work, perform hundreds of readings (Parayans), and conduct weekly recitations (Saptahs). This must be done, as Chapter 0 states, with a firm resolve, pure heart, selfless love, and unwavering devotion, and it is a practice that can be integrated with family life.