How does Chapter 52 explain the concept of non-duality and the devotee's merging with the Guru?

Chapter 52 uses several powerful analogies to explain the concept of non-duality, where the devotee merges with the Guru and loses their individual sense of "I-ness." It states that when a devotee takes refuge at Sai's feet, no duality remains. This is compared to a river entering the ocean and forgetting its river-ness to become the ocean itself. Other analogies include salt entering the ocean and becoming one with it, two lamps embracing to become a single light, and the inseparability of scent from camphor or light from the sun. Through these examples, Chapter 52 illustrates that by relinquishing their ego, devotees become equal with the Guru, achieving a state of complete unity.