What is the central theme of Chapter 6 regarding the role of the Sadguru?

The central theme of Chapter 6 is the supreme glory and indispensable role of the Sadguru, embodied by Sai Baba. The chapter begins by likening the Sadguru to a helmsman who safely guides the boat of life, whether in spiritual or worldly matters, to the far shore. It details how the Guru's touch and grace can burn away ego, wash away impurities from many births, and grant divine bliss. As Chapter 6 explains, the Sadguru awakens the devotee's true self ('Soham'), dissolves the illusion of duality, and even empowers the disciple to perform tasks, such as writing the holy text itself.