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

Chapter 52 uses powerful metaphors to explain the principle of non-duality. It states that just as a river forgets its "river-ness" when it embraces the ocean, a devotee who takes refuge in the Guru loses any sense of duality. The text further illustrates this with the analogy of two lamps becoming one when they embrace, where the state of duality vanishes, and there is only a single, unified light. According to this chapter, Sai Baba, through the power of love, mysteriously led His faithful devotees toward this supreme goal, making them liberated while still in their physical bodies by removing any sense of separation between them and Him.