According to Chapter 6, what is the significance and power of a Sadguru, specifically in relation to Sai Baba?

Chapter 6 of the Sai Satcharitra extensively glorifies the role of the Sadguru, identifying Sai Baba as the ultimate spiritual guide. The text uses the metaphor of a helmsman, stating that only the boat guided by a Sadguru can safely cross the ocean of worldly existence. As detailed in this chapter, the Sadguru's power is immense; a mere touch of His hand, especially when accompanied by Udi from the Dhuni, can fill a devotee's heart with bliss and love. Furthermore, the chapter explains that the Guru's touch has the profound ability to burn away the subtle body of ego, which even the fire of dissolution cannot destroy, and to wash away the accumulated impurities of many past births, purifying the devotee completely.