According to Chapter 6, what is the significance of a Sadguru in a person's spiritual and worldly life?

Chapter 6 of the Sai Satcharitra beautifully illustrates the paramount importance of a Sadguru, describing him as the helmsman of a boat who ensures it reaches the 'far shore,' whether in spiritual or worldly matters. The chapter states 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 touch, along with Udi from the Dhuni, is so powerful that it can burn away the subtle body, or ego, into ashes. The Guru's hand washes away the accumulated impurities of many births, making devotees pure and guiding them to safety.