According to Chapter 40, what is the significance of a devotee seeking 'exclusive refuge' in Sai Baba, and what metaphor is used to explain this process?

Chapter 40 teaches that when a devotee seeks exclusive refuge in the Sadguru with genuine devotion, a profound spiritual transformation occurs. The text explains that this act of surrender leads the Sadguru to grant the devotee His own Guru-nature. To illustrate this merging of consciousness, the chapter uses the metaphor of a river and an ocean. It states that while the river and ocean have different names, they are essentially one, and when they meet, no difference remains. Similarly, as described in Chapter 40, when a devotee dissolves their separate identity and seeks complete refuge in Sai, the sense of duality is destroyed, and they are embraced by Him.