The preface mentions two significant Guru biographies suitable for devotional readings in Maharashtra. What are they and why is the Shri Sai Satcharita so important?

The preface in Chapter 0 highlights two major, detailed poetic biographies suitable for Parayans and Saptahs in Maharashtra. The first is the 'Brihat or Thorale Guru Charitra' about Shri Narsimha Saraswati Maharaj. The second, and more recent, is the 'Shri Sai Satcharita' written by Annasaheb Dabholkar about Shri Sai Baba Maharaj. This work is described as sweet, inspirational, and grace-filled. Its importance lies in being one of only two such detailed works found, providing a comprehensive and famous text for Sai's devotees to study, perform Parayans, and thereby engage in Guru service and community worship.