Can you explain the significance of the Sadguru's hand as detailed in the opening sections of Chapter 6?

Chapter 6 places great emphasis on the power and significance of the Sadguru's hand. It is described as a vehicle for divine blessing and transformation. The chapter notes that when Sai Baba places His hand on a devotee's head, it is a profound blessing that can cause the heart to overflow with self-bliss. The touch of the Guru's hand is described as wondrously potent, capable of burning away the subtle body, or ego, into ashes. Furthermore, this chapter states that by placing His lotus-hand on the head, the Sadguru can wash away the accumulated impurities of many past births, purifying the devotee completely.