According to the sixth chapter of Sai Satcharitra, what is the significance of the Sadguru's touch?

Chapter 6 describes the touch of the Sadguru's hand as wondrous and transformative. It states that when Sai places His blessing hand on a devotee's head, it can burn away the subtle body, or ego, which is something that even the fire of dissolution cannot destroy. This divine touch, often accompanied by Udi, fills the heart with self-bliss and love. As further detailed in Chapter 6, by placing His lotus-hand on the head, the Sadguru can wash away the accumulated impurities of many past births, purifying the devotee completely and granting stability to a wandering mind.