How does the text differentiate between writing about worldly Gurus, multiple saints, and one's own Sadguru in terms of spiritual benefits?

Chapter 0 draws a clear distinction between different types of biographical writing. Writing about worldly gurus and writers is considered a worldly service with fruits that are limited by time and space and do not yield eternal spiritual benefits. Writing biographies of many saints is a step above, considered a form of Guru service that does yield spiritual fruits, but it is described as one-sided or partial, making it insufficient for attaining the ultimate spiritual goal. In contrast, writing the biography of one's own Sadguru, and engaging with it through dedicated study and recitation, is presented as the best and most certain path to salvation.