Using the metaphors provided in Chapter 52, can you explain the concept of non-duality and how a devotee achieves it?

Chapter 52 uses vivid metaphors to illustrate the state of non-duality. It explains that when a devotee takes refuge in the Guru, any sense of duality is lost, similar to how a river forgets its own 'river-ness' and identity upon merging with the vast ocean. Another powerful image used is that of two lamps embracing, which immediately causes the state of duality to vanish, leaving only one unified light. This chapter teaches that Sai Baba led his faithful devotees toward this supreme goal of liberation and non-duality through the power of love.