How does the act of writing and studying a Guru's biography, like the Shri Sai Satcharita, create a legacy and serve a broader community?

The creation and study of a Guru's biography establish a powerful spiritual legacy. Chapter 0 explains that a Sadguru takes service from devotees through books. By having a devotee like Annasaheb Dabholkar write the Shri Sai Satcharita, the Sadguru accepted service in the form of study and Parayans from both the writer and the wider congregation of devotees. This act leaves the world in their debt. When devotees study and perform Parayans of such a detailed poetic biography, the writer gains the merit of public service, and the participating devotees are guided toward achieving the purpose of their lives, thus building a strong and spiritually fulfilled community.