According to Chapter 40, how does Sai Baba help his devotees overcome duality and achieve spiritual union?

Chapter 40 explains that Shri Sai Samarth facilitates spiritual union by actively dissolving the devotee's sense of separateness. The text describes how He destroys the sense of duality, "dissolving the separate feelings of 'me' and 'you'." A key method mentioned is shaktipat, or the transmission of spiritual energy, which occurs when His hand is placed upon a devotee's head. For those who seek exclusive refuge with devotion, He embraces them and grants them "His own Guru-nature." This profound merging is illustrated in Chapter 40 with the analogy of a river meeting the ocean during the rainy season, where no difference remains between them, signifying the complete dissolution of the individual self into the Guru's consciousness.