What is the central theme of Chapter 15, and what analogy is used to illustrate the relationship between Sai and His devotees?

Chapter 15 primarily describes the prayers of loving devotees to Sai and how He, being pleased, grants them His vision. The chapter uses a beautiful analogy of a mother cat and her kittens to illustrate this dynamic. As described in Chapter 15, just as kittens persistently seek their mother's affection, even if she initially growls, their loving persistence causes her milk to flow and she lovingly accepts them. Similarly, the text suggests that a devotee's unwavering love and prayer will please Sai, who will then forget any initial annoyance and shower them with His grace and vision, destroying the fear of worldly existence.