Chapter 15 suggests that a devotee's persistence is key to receiving the Guru's grace. How is this theme developed from the introduction to the main analogy?

Chapter 15 develops the theme of persistence and grace by first establishing the high value of the Guru's vision, stating that only those with 'immense merits' attain Sai's darshan. It then transitions to the author's own act of humble persistence in asking the listeners for their attention. This sets the stage for the chapter's main narrative, which is about how loving devotees' prayers please Sai. The theme culminates in the powerful analogy of the mother cat and kittens, explicitly mentioned in Chapter 15. The kittens' unwavering, loving push to be near their mother, despite her initial annoyance, directly causes her grace—in the form of milk—to flow. This progression illustrates that a devotee's persistent, loving effort is the very 'means to the supreme goal.'