How does Chapter 6 describe the Sadguru's role in helping a devotee realize the principle of non-duality (Advaita)?

Chapter 6 provides a deep insight into the Sadguru's role in a devotee's spiritual evolution towards non-duality. The text explains that the Guru awakens the intrinsic sense of 'I am He' (Soham) and reveals the devotee's innate bliss. As detailed in the chapter, this awakening process directly dissolves the limiting sense of 'me and mine' right on the spot. By removing the veil of ego and separation, the Sadguru manifests the harmony of non-duality (Advaita), allowing the devotee to experience the unity of the self with the divine. The Guru's grace is presented as the key to burning away the ego, which is the primary obstacle to this realization.