How does the author describe the nature and power of the Sadguru in the introductory verses of Chapter 18?

The introductory verses of Chapter 18 are a powerful hymn of praise that describes the supreme nature of the Sadguru. The author proclaims, "Victory to the Sadguru, the supreme Eternal one! Victory to the Sadguru, the Truth of Brahman!" The Guru is portrayed as the "Ruler of Maya," who can show the world to be an illusion and make the "Unperceivable One" known to devotees effortlessly. The text also states that the Sadguru is "Beginningless and Endless" and "beyond duality." According to this chapter, falling under the Guru's grace eliminates the false logic of "mine" and "thine," showing the Guru's power to dissolve ego and division.