What is the main theme and introduction provided in the opening sections of Chapter 15 of the Shri Sai Satcharitra?

Chapter 15 begins with traditional salutations and then establishes a humble and devotional tone for the reader. The author starts by stating that only those with immense merit are fortunate enough to get the vision (darshan) of Sai, which helps them overcome worldly afflictions. The chapter then presents a plea from the author to the listeners, who are compared to a vast ocean that accepts all rivers. As detailed in Chapter 15, the text promises significant spiritual rewards for listening with faith, including devotion, liberation, and peace. It concludes its introduction by setting the stage for the stories to come, using a tender analogy of a mother cat and her kittens to describe how a Guru responds to the loving persistence of devotees.