What does Chapter 6 of Sai Satcharitra teach about the power and grace of a Sadguru's touch?

Chapter 6 of the Sai Satcharitra elaborates on the profound power of a Sadguru's grace, particularly through their physical touch. The text states that when Sai Baba places His blessing hand, along with Udi, upon a devotee's head, their heart overflows with self-bliss. This touch is described as wondrously potent, capable of burning away the subtle body of ego into ashes, an impurity that even the fire of dissolution cannot burn. As mentioned in Chapter 6, this simple act of placing His lotus-hand on the head is said to wash away the accumulated impurities of many lifetimes, rendering Sai's devotees pure and spiritually cleansed.