Can you provide a summary of the key topics introduced in Chapter 51 of the Sai Satcharita?

Chapter 51 of the Sai Satcharita begins with traditional invocations and explains the purifying effect of listening to and speaking the sacred text. It briefly recaps the previous chapter's discussion on the destruction of ignorance by referencing a conversation between Lord Krishna and Arjuna from the Bhagavad Gita. As mentioned in Chapter 51, the primary focus then shifts to introducing the stories that will be narrated. These include the marvelous account of how Kakasaheb was established in Shirdi, his past-life bond (rinanubandh) with Sai, and three additional stories of other devotees that are meant to soothe the hearts of listeners.