What is the significance of performing a 'Parayan' or 'Saptah' of a Guru's biography, and why are detailed works like the Shri Sai Satcharita considered essential for this?

According to Chapter 0, performing a Parayan (a devotional reading, often over a week, known as a Saptah) of a detailed poetic Guru biography is a form of Guru service. While some biographies exist in works by poets like Shri Dasganu Maharaj, they are often too brief, spanning only a few pages, making them unsuitable for a comprehensive Parayan. Chapter 0 emphasizes that detailed, comprehensive works like the Shri Sai Satcharita are crucial because they allow devotees to deeply immerse themselves in the Guru's life and teachings. By studying such a text, the writer performs service, and other devotees who also study it gain merit and achieve life's purpose.