How does Chapter 6 describe the power and grace of a Sadguru, specifically referring to Sai Baba?

Chapter 6 of the Sai Satcharitra beautifully illustrates the immense power and grace of a Sadguru, with Sai Baba as the prime example. The chapter explains that a Sadguru is like a helmsman who guides the boat of life to the far shore. When the Sadguru, such as Sai, places his blessing hand along with Udi from the Dhuni on a devotee's head, the heart overflows with bliss. This wondrous touch is so powerful that it can burn away the subtle body of ego into ashes, an act not even possible in the fire of dissolution. Furthermore, as described in Chapter 6, placing his lotus-hand on a devotee's head washes away the accumulated impurities of many past births, making them pure.