Based on the text, how does performing Parayan of a Guru's biography cultivate the virtues of shraddha and saburi?

The provided text does not establish a connection between performing Parayan and the cultivation of 'shraddha' and 'saburi'. While Chapter 0 discusses the practice of performing Parayan or Saptah of a Guru's biography as a form of Guru service, it does not mention 'shraddha' or 'saburi' at all. The text's focus is on the merits of studying a detailed biography for both the writer and the reader, who can achieve public service and life's purpose, but it does not specify the particular virtues cultivated, especially not the ones you've asked about.