The preface mentions two ways a Sadguru accepts service through books. How does this apply to Sai Baba and his followers who wish to create a collective spiritual practice?

As detailed in Chapter 0, a Sadguru accepts service either by creating great works himself or by having his biographies written by devotees for others to study. For Sai Baba's followers, the second form of service is key to building a community. The text highlights the importance of the 'Shri Sai Satcharita', written by devotee Annasaheb Dabholkar. By collectively studying and performing Parayans of this comprehensive biography, the community of devotees engages in a form of service to the Guru. This shared activity serves God in humanity (Jan-Janardan) and helps devotees achieve the purpose of their lives, creating a strong spiritual foundation for the community.