My question was about 'shraddha' and 'saburi'. Why is your answer about 'Kamya' and 'Nishkam' service?

Your question about 'shraddha' and 'saburi' cannot be answered from the provided source because those terms are not present in the text. The answer discusses 'Kamya' and 'Nishkam' service because that is the relevant information contained within the source. Chapter 0 explicitly states that Guru biographies and other spiritual texts can be used in two ways: with desire (Kamya) for worldly benefits, or with a selfless mind (Nishkam) for spiritual liberation. This distinction is a central point in the preface, which describes the purpose and value of studying a Guru's life story. My response is constrained to providing only the facts found in the given material.