The preface mentions 'shraddha' and 'saburi'. Can you explain what these Marathi terms mean in the context of Guru service?

The provided source material from the preface, which corresponds to Chapter 0, does not mention or define the terms 'shraddha' and 'saburi'. Instead, this chapter discusses the nature and purpose of Guru biographies. It explains that these texts can be utilized in two ways: with desire (Kamya) for worldly prosperity, or with a selfless mind (Nishkam) for liberation from the cycle of birth and death. As noted in Chapter 0, Nishkam Guru service is always considered superior, whether it involves writing a biography or any other form of service.