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

Chapter 18 portrays the Sadguru, Sai Baba, as the supreme and eternal truth of Brahman, the Ruler of Maya who reveals the world as an illusion. The text uses powerful imagery to convey this, comparing a devotee approaching the Guru to a salt doll entering the ocean—it dissolves and becomes one, unable to return to its original form. This illustrates the complete merging of the devotee with the divine through the Guru's grace. Furthermore, the chapter explains that the Sadguru effortlessly makes the Unperceivable, which the Vedas and Shrutis debate endlessly, visible to His devotees. As mentioned in the opening verses of Chapter 18, the Sadguru is hailed as the Beginningless and Endless, beyond duality and without blemish, the ultimate teacher of the knowledge of the Self.