How does Chapter 6 of the Sai Satcharitra describe the power and importance of a Sadguru, specifically in relation to Sai Baba?

Chapter 6 of the Sai Satcharitra portrays the Sadguru as an indispensable guide, stating that any endeavor, spiritual or worldly, will succeed only if the Sadguru is the helmsman of that boat. The text emphasizes that the very mention of 'Sadguru' immediately brings Sai Baba to mind, who is said to place His blessing hand on the devotee's head. This divine touch, often accompanied by Udi, is described as wondrous and powerful. It can burn away the ego, which is referred to as the subtle body, and wash away the impurities accumulated over many lifetimes, leaving Sai's devotees pure and filled with self-bliss.