Based on Chapter 12, what is the role of a Guru like Sai in helping a devotee overcome worldly existence and duality?

Chapter 12 explains that a Guru like Sai Baba is the embodiment of 'Truth, Consciousness, and Bliss' and is the 'source of joy, who stills the waves of worldly existence.' The Guru's primary role is to remove the obsession with duality, even from the 'dull-witted,' by imparting the knowledge of non-duality. The text uses powerful metaphors, describing saints as the 'Agastya' who drank the ocean, suggesting they can absorb the entire ocean of worldly existence for their devotees, and as the 'sun for the darkness of ignorance,' illuminating the path to liberation.