Based on the initial verses of Chapter 6, what is the role and significance of a Sadguru in a person's life?

As described in the opening verses of Chapter 6, the Sadguru is portrayed as the essential helmsman of a boat, guiding it safely to the far shore in both spiritual and worldly matters. The mere utterance of the word 'Sadguru' brings Sai Baba to mind, who is said to place His blessing hand on the devotee's head. This touch, along with Udi, fills the heart with bliss and is powerful enough to burn away the subtle body of ego, which even the fire of dissolution cannot destroy, showcasing the Sadguru's profound importance.