What does Baba teach about shraddha and saburi in Marathi transliteration, according to the provided text?

The provided text does not contain any information about Baba's teachings on 'shraddha' and 'saburi'. The source material from Chapter 0 serves as a preface, focusing on the nature and purpose of Guru biographies. It discusses how studying these texts is a form of Guru service and explains the distinction between desire-based (Kamya) and selfless (Nishkam) study. It also mentions the contributions of Marathi poets like Shri Mahipati and Shri Dasganu Maharaj to this genre, but does not delve into specific spiritual doctrines like shraddha or saburi.