Why does the preface focus on the tradition of writing Guru biographies rather than explaining essential principles like 'shraddha' and 'saburi'?

The preface detailed in Chapter 0 prioritizes the tradition of writing Guru biographies because it frames this act as a supreme form of Guru service. The text explains that a Guru's biography is a reliable book describing their incarnation, miracles, and life, and that studying it constitutes an incomparable and salvation-granting service. This practice is noted as being ancient, with its mention in the Narada Purana. The focus is on the literary and devotional act of creating and studying these texts for either worldly (Kamya) or selfless (Nishkam) purposes, rather than on defining specific philosophical principles like 'shraddha' or 'saburi'.