What is the primary purpose and introduction of Chapter 51 of the Shri Sai Satcharitra?

Chapter 51 of the Shri Sai Satcharitra begins with devotional salutations and establishes its purpose as a purifying spiritual narrative. The text emphasizes that the very act of engaging with it is sanctifying, stating, "By listening to this Sai Charitra, both the listener and the speaker become pure." It uses analogies like sandalwood soothing heat or clouds showering rain to illustrate the benevolent function of such stories. As outlined in Chapter 51, it then serves as a preface, announcing its intention to narrate the marvelous account of how Kakasaheb came to be established in Shirdi, along with three other devotee stories meant to soothe the hearts of listeners.