How is reading about Baba's life considered a form of service, and how might that help my spiritual progress?

According to the preface material found in Chapter 0, a Sadguru accepts two kinds of service from devotees through books. One way is by having their biographies written by devotees. The writer performs Guru service through this act, and when other devotees study and perform devotional readings (Parayans) of that work, the writer gains merit while those devotees can achieve their life's purpose. The Shri Sai Satcharita, written by Annasaheb Dabholkar, is presented as an inspirational and grace-filled biography specifically suited for such Parayans. Engaging with this text is thus a direct form of service that can invigorate one's spiritual life.