What is the main theme and introductory message of Chapter 15?

Chapter 15 begins with traditional salutations and establishes that attaining the vision, or 'darshan', of Sai is a reward for immense merit, which helps one overcome afflictions and achieve the supreme goal. The author then humbly addresses the listeners, comparing them to a vast ocean that accepts all rivers, and asks for their focused attention. The chapter promises that listening with faith will grant devotion, liberation, happiness, and peace. As Chapter 15 explains, its primary focus is to describe the loving devotees' prayers to Sai and how He, pleased by their devotion, grants them His vision, much like a mother cat nurtures her kittens.