How does Chapter 18 describe the fundamental nature of the Sadguru?

Chapter 18 offers profound praise for the Sadguru, describing him as the supreme, eternal one and the very truth of Brahman. The text extols him as the 'Ruler of Maya,' who shows the world to be an illusion through direct experience. He is portrayed as beginningless, endless, and beyond duality. The chapter also uses a powerful analogy, comparing a devotee approaching the Guru to a salt doll entering the ocean—it dissolves and becomes one, highlighting the transformative and unifying experience of surrendering to the Sadguru, as detailed in the opening verses of Chapter 18.