How does the beginning of Chapter 18 describe the nature and qualities of the Sadguru?

The introductory verses of Chapter 18 offer profound praise for the Sadguru, highlighting his supreme nature. He is hailed as the "supreme Eternal one" and the "Truth of Brahman." The text states that through experience, the Guru shows the world to be an illusion, identifying him as the "Ruler of Maya." Furthermore, the Sadguru is described as "Beginningless and Endless," beyond duality, and without blemish. A key role identified in this chapter is that the Guru is the "teacher of the knowledge of the Self," who can effortlessly point out the "Unperceivable One" to his devotees, a feat that even the Vedas and Shrutis struggle with.