How is the Sadguru's nature and power described at the beginning of Chapter 18?

Chapter 18 opens with powerful praises, describing the Sadguru as the supreme Eternal one and the very Truth of Brahman. The text hails the Guru as being beyond duality and without blemish, the one who teaches the knowledge of the Self and shows the world to be an illusion. A compelling metaphor is used to illustrate the devotee's experience: just as a salt doll entering the ocean can never return, one who approaches the Guru merges completely. This highlights the Guru's immense power as the "Ruler of Maya," capable of dissolving the individual ego into the divine.