How does the spiritual value of writing a Sadguru's biography compare to writing about worldly figures or multiple saints?

The text draws a clear distinction in spiritual value. Writing about worldly Gurus, such as thinkers and writers, is considered a worldly service limited by time and space and rooted in self-interest, therefore it does not yield spiritual fruits. Chapter 0 also states that writing biographies of many saints is a form of Guru service, but it is considered one-sided or partial. In contrast, writing the biography of one's own Sadguru and engaging in its devotional study is presented as the most certain and complete service for attaining the ultimate spiritual goal of salvation.