How does Chapter 18 describe the nature of the Sadguru and the effect of approaching him?

Chapter 18 begins with powerful invocations that describe the Sadguru, Sainath, as the supreme Eternal one and the Truth of Brahman. He is hailed as the 'Ruler of Maya' who shows the world to be an illusion through direct experience. The chapter uses a compelling metaphor to explain the effect of approaching the Guru: just as a salt doll entering the ocean to bathe would dissolve and never return, so too does a devotee who approaches the Guru merge with him. As detailed in the opening verses of this chapter, this illustrates a complete dissolution of the individual ego into the vastness of the Guru's grace and consciousness.