What information does the provided text offer regarding the Marathi terms 'shraddha' and 'saburi'?

The provided source material from Chapter 0 does not contain any information about the specific Marathi concepts of 'shraddha' or 'saburi.' Instead, the text focuses on the tradition and purpose of Guru biographies as a form of spiritual text. As described in Chapter 0, it explains that studying these texts is a form of Guru service, which can be performed either with desire (Kamya) for worldly benefits or selflessly (Nishkam) for liberation from the cycle of birth and death. The text consistently emphasizes that Nishkam service is the superior form.