Can you explain the concept of non-duality and how a devotee achieves it, based on the analogies in Chapter 52?

Chapter 52 uses several powerful analogies to explain the attainment of non-duality. It teaches 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 forgetting its 'river-ness' to become the ocean itself. Another analogy given is of two lamps embracing to become one single light, where the state of duality immediately disappears. Similarly, just as salt entering the ocean becomes one with it, devotees who relinquish their 'I-ness' become equal with Sai, leaving no separation or duality between them.