What does Chapter 40 reveal about Shri Sai's ability to destroy the sense of duality and unify a devotee with the Guru?

Chapter 40 explains that Shri Sai Samarth has the profound ability to make 'the unattainable attainable by destroying the sense of duality.' It describes this process as 'dissolving the separate feelings of "me" and "you"' for anyone who offers a full prostration and seeks exclusive refuge. To illustrate this spiritual unification, the chapter employs the metaphor of a river and an ocean, which have different names but are essentially one and become indistinguishable when they meet. Similarly, the text clarifies that when a devotee approaches the Sadguru with true devotion, the Guru grants them 'His own Guru-nature,' effectively erasing the distinction between them.