What are the main topics and stories introduced at the beginning of Chapter 51 of the Shri Sai Satcharita?

Chapter 51 of the Shri Sai Satcharita begins with invocations and explains the purifying power of listening to the scripture, stating that it sanctifies both the speaker and the listener. As detailed in the chapter, it bridges from the previous discussion on destroying ignorance by referencing the dialogue between Krishna and Arjuna in the Bhagavad Gita. The chapter then announces its forthcoming content, promising to narrate the marvelous account of how Kakasaheb was established in Shirdi, exploring his past-life bond (rinanubandh) with Sai. Additionally, Chapter 51 mentions that it will also share three other stories of three devotees, which will soothe the hearts of the listeners.