How does the Narada Purana connect the concepts of shraddha and saburi to the writing of a Guru's biography?

The provided text does not establish any connection between the Narada Purana and the concepts of 'shraddha' and 'saburi'. According to Chapter 0, the Narada Purana is mentioned solely to confirm that the service of writing a Guru's biography is a very ancient tradition. The source material defines a Guru's biography as a reliable book detailing the Guru's incarnation, life stages, wonderful plays (Leelas), and miracles. There is no information linking these biographies or the Narada Purana to the specific principles of 'shraddha' and 'saburi'.