What metaphors does Chapter 52 use to illustrate the concept of non-duality and the devotee's union with the Guru?

To explain the state of non-duality, Chapter 52 employs powerful metaphors. It compares a devotee taking refuge in the Guru to a river embracing the ocean, at which point the river forgets its own 'river-ness' and loses any sense of separation. Another beautiful metaphor used in this chapter is that of two lamps embracing. When they come together, they become one, the state of duality vanishes immediately, and there is only a single, unified light. These illustrations convey how the devotee merges with the Guru, leaving no sense of duality behind.