What are the key metaphors used in Chapter 18 to explain the Guru's role and the experience of a devotee?

Chapter 18 employs several vivid metaphors to explain the Guru's nature and the devotee's journey. The most striking is the comparison of a devotee to a 'doll made of salt' entering the ocean. This illustrates the complete merging and dissolution of the individual self upon approaching the Sadguru, from which there is no return to the former state. The chapter also compares the Guru to 'rain clouds of the monsoon,' showering the 'water of self-bliss' with love upon everyone, signifying his impartial and abundant grace. These metaphors highlight the transformative and all-encompassing nature of the Guru's presence.