Could you provide a summary of the main points about the glory of Udi as it is discussed in Chapter 33 of the Sai Satcharitra?

Chapter 33 of the Sai Satcharitra is dedicated to explaining the glory of Udi, or sacred ash. It outlines Sai Baba's daily ritual of maintaining a sacred fire, the Dhuni, with logs of wood and then distributing the resulting ash to devotees at all times of the day. The chapter highlights that this Udi also served as a formal sign of permission for devotees to leave Shirdi. More importantly, the text reveals the deep spiritual meaning behind this practice. The Udi symbolizes the impermanence of the entire physical universe, including our own bodies, which will eventually turn to ash. As Chapter 33 teaches, this serves as a constant reminder that the world is pervaded by illusion (Maya) and that only Brahman is the ultimate, eternal reality.