Can you explain the more advanced spiritual concepts mentioned in Chapter 6, like Advaita and the destruction of the ego?

Chapter 6 delves into some profound spiritual concepts, explaining that the Sadguru's grace is the key to transcending the ego. The text describes the ego as a 'subtle body' which is burned to ashes by the mere touch of the Guru's hand, a feat not even the 'fire of dissolution' can achieve. This purifies the devotee. Furthermore, this chapter states the Sadguru's role is to awaken the sense of 'I am He' (Soham), a core principle of non-duality, or Advaita. As this realization dawns, the sense of 'me and mine' dissolves, revealing innate bliss and the harmony of non-duality where the distinction between the individual self and the divine disappears.