How does Chapter 18 of the Shri Sai Satcharitra describe the nature and power of the Sadguru?

Chapter 18 portrays the Sadguru as the supreme, eternal, and beginningless divine principle. The text refers to the Guru as the "Ruler of Maya" who is beyond duality and without blemish. A powerful metaphor is used to describe the effect of approaching the Guru: just as a salt doll entering the ocean to bathe can never return, a devotee who approaches the Sadguru merges with the divine, losing their individual identity. As Chapter 18 explains, the Guru can effortlessly point out the "Unperceivable One" that the Vedas and Shrutis debate endlessly, making the divine accessible to devotees through grace.