What benefits are gained by writing and studying detailed Guru biographies like the Shri Sai Satcharita?

The preface in Chapter 0 outlines several benefits associated with the creation and study of detailed Guru biographies. For the writer, the act of composing the biography is considered a form of Guru service. When other devotees subsequently study and perform Parayans of that work, the writer also gains the merit of serving God in humanity (Jan-Janardan) and performing a public service. For the devotees who read and study the biography, engaging in these Parayans is a means to achieve the ultimate purpose of their lives, as it is a form of service accepted by the Sadguru.