What is the primary theme introduced at the beginning of Chapter 18 of the Shri Sai Satcharitra?

Chapter 18 begins with a series of profound salutations and praises for the Sadguru, describing him as the supreme Eternal one and the ruler of Maya. A central theme introduced is the complete surrender and merging of a devotee with the Guru, illustrated by the analogy of a salt doll dissolving in the ocean, from which it can never return. As described in Chapter 18, this process eliminates the false logic of "mine" and "thine" and allows the Guru to effortlessly reveal the Unperceivable One to the devotee.