How does the author differentiate between the spiritual value of writing about many saints versus writing about one's own Sadguru?

The author presents a hierarchy of spiritual service through writing. While writing the biographies of many saints is acknowledged in Chapter 0 as a form of Guru service that yields spiritual fruits, it is ultimately classified as 'one-sided or partial.' It is stated that attaining the ultimate spiritual goal merely through this activity is 'difficult, or rather impossible.' In contrast, the service of writing the biography of one's own Sadguru, when done with selfless love and unwavering devotion, is presented as the 'best and most certain' path that 'grants the fruit of salvation.' The key difference is the focused, deeply personal, and complete devotion directed towards one's chosen Sadguru, making the act spiritually whole rather than partial.