Can you explain the concept of non-duality as presented in Chapter 40 of the Shri Sai Satcharitra?

Chapter 40 of the Shri Sai Satcharitra explains the concept of non-duality through the actions and grace of Shri Sai Samarth. The text states that He destroys the sense of duality by dissolving the separate feelings of "me" and "you." This is the process through which He makes the unattainable attainable for his followers. The chapter uses the metaphor of a river meeting the ocean to illustrate this principle: though they have different names, they are fundamentally one, and upon meeting, no difference remains. This is what happens when a devotee seeks exclusive refuge in Sai, who embraces them and merges them into His own nature.