What does Chapter 18 say about the effect a Guru has on a devotee who approaches them?

Chapter 18 explains that the effect of a Guru on a devotee is one of complete transformation and merging. It uses the metaphor of a salt doll entering the ocean to take a bath, asking if it can ever return. The answer is that it cannot, as it dissolves and becomes one with the ocean. The chapter states that a similar fate awaits one who approaches the Sadguru. Furthermore, it clarifies that if one is fortunate enough to fall under the Guru's grace, the false logic of 'mine' and 'thine' disappears, showing how the Guru dissolves the ego and duality in a devotee, as described in Chapter 18.