Based on the preface, how does the 'Shri Sai Satcharita' function as a foundational text for the community of Sai Baba's followers?

The preface, detailed in Chapter 0, identifies the 'Shri Sai Satcharita' by Annasaheb Dabholkar as a cornerstone for Sai Baba's devotees. It is described as a recent, sweet, inspirational, and grace-filled biography, and is one of only two such detailed Guru biographies found in Maharashtra suitable for Parayans. By providing a comprehensive account that was published over six years, it allows the congregation of devotees to engage in collective study and devotional readings. This shared practice of accepting the Sadguru's service through his biography is fundamental to building a community and helping devotees achieve their life's purpose.