What does the provided text from Chapter 0 say about Baba's teachings on 'shraddha' and 'saburi' in Marathi?

The provided source material from Chapter 0 does not contain any information about Sai Baba, nor does it mention the specific teachings of 'shraddha' or 'saburi'. Instead, this chapter serves as a preface that discusses the nature and purpose of Guru biographies. It explains that such texts can be used with desire for worldly gains (Kamya) or with a selfless mind for liberation (Nishkam), with Nishkam service being considered superior. The text focuses on the tradition of writing these biographies, citing authors like Mahipati and Dasganu Maharaj, but does not delve into the specific teachings of any single Guru.