According to Chapter 6 of the Sai Satcharitra, what is the role and significance of a Sadguru in a person's life?

Chapter 6 beautifully illustrates the paramount importance of a Sadguru, portraying him as the essential helmsman of a boat, ensuring it safely reaches the far shore of life, whether in spiritual or worldly matters. The text emphasizes that the mere utterance of the word 'Sadguru' brings Sai Baba to mind, who then places his blessing hand on the devotee's head. This divine touch is described as wondrous, capable of burning away the subtle body of ego and washing away the accumulated impurities of many past births, purifying the devotee completely. The chapter posits that with a Sadguru's guidance, one's journey is secure and transformative.