According to Chapter 6, what is the significance of the Sadguru's hand and touch for a devotee?

Chapter 6 describes the touch of the Guru's hand as wondrous and transformative. It states that when the Sadguru, like Sai, places his blessing hand on a devotee's head, especially with Udi from the Dhuni, it can cause the heart to overflow with self-bliss. This touch is so powerful it can burn away the subtle body, or ego, into ashes. Furthermore, the chapter explains that by placing His lotus-hand on the head, the accumulated impurities of many past births are washed away, rendering Sai's loving devotees pure and granting stability to wandering, nonsensical thoughts.