How does the practice of writing a Sadguru's biography function as the ultimate form of Guru service?

According to the principles discussed in Chapter 0, the most certain and superior form of written service that grants salvation is writing the biography of one's Sadguru. This can be undertaken by the Guru's command or through personal inspiration. The practice involves not only the act of writing but also regular personal study, performing hundreds of readings (Parayans), and weekly recitations (Saptahs) with a firm resolve, pure heart, and selfless love. This form of service, engaging the body and speech, is considered a path to liberation from the cycle of birth and death (Nishkam) and is deemed superior to service done for worldly gains, as it does not interfere with one's family or worldly responsibilities.