How does Chapter 52 describe the concept of non-duality, or the merging of a devotee with Sai?

Chapter 52 uses several powerful analogies to explain the state of non-duality. It states that when a devotee takes refuge at Sai's feet, the sense of duality vanishes. This is compared to a river entering the ocean and becoming the ocean itself, or salt instantly becoming one with the ocean upon entering it. Another metaphor used is of two lamps embracing to become one light, where the state of duality disappears. The chapter concludes that by relinquishing their 'I-ness,' devotees become equal with Him, achieving a state of unity where no separation remains.