How does Chapter 52 use the metaphors of a river and lamps to illustrate the concept of non-duality in devotion?

Chapter 52 uses powerful metaphors to describe the union of a devotee with the Guru. It compares the devotee taking refuge to a river that 'forgets its river-ness' upon embracing the ocean, signifying how Sai Baba erases any sense of duality in His followers. Another beautiful analogy presented in the chapter is that of two lamps embracing to become one. In this union, 'the state of duality vanishes,' and only a single, unified light remains. Both metaphors powerfully illustrate the ultimate goal of devotion: the complete merging with the divine and the attainment of a state of non-duality.