How does Chapter 18 describe the nature of a Sadguru like Sai Baba and the effect he has on his devotees?

Chapter 18 poetically describes the Sadguru as the "supreme Eternal one" and the "Ruler of Maya," who reveals the world as an illusion. The text explains that approaching the Guru is like a salt doll entering the ocean; the devotee merges and cannot return to their former state. The Guru is also compared to monsoon rain clouds, lovingly showering the water of self-bliss. As mentioned in Chapter 18, when a person is fortunate enough to receive the Guru's grace, the divisive logic of "mine" and "thine" disappears, and the Guru effortlessly points out the "Unperceivable One" that the Vedas endlessly debate.