Can you explain Baba's core teachings of shraddha and saburi as described in this text?

The provided source material does not contain any information about Baba or the specific teachings of 'shraddha' and 'saburi'. Instead, the text focuses on the nature and purpose of Guru biographies and spiritual knowledge texts. As explained in Chapter 0, these texts can be used in two ways: with desire (Kamya) for worldly benefits like removing worries, or with a selfless mind (Nishkam) for liberation from the cycle of birth and death. The text emphasizes that Nishkam Guru service, such as studying a Guru's biography for spiritual freedom, is always considered superior.