According to the text, what is the most effective form of written Guru service for attaining spiritual liberation?

The Preface (Chapter 0) identifies the "best and most certain service in writing that grants the fruit of salvation" as writing 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 service doesn't end with writing; it must be followed by personal, regular study, including performing numerous readings (Parayans) and weekly recitations (Saptahs) with a pure heart, firm faith, and unwavering devotion. For these devotional practices, detailed poetic biographies are noted as the most suitable format.