How did Sai Baba use the symbolism of Udi to teach about the impermanence of the body and the reality of Brahman?

Sai Baba masterfully used the Udi, or sacred ash, as a teaching tool for high spiritual concepts. Chapter 33 explains that Baba wanted devotees to understand that the body, which is made of the five elements, is merely a temporary vessel for experiencing one's destiny. Once those destined enjoyments are exhausted, the body becomes motionless and turns to ash. By giving Udi, he encouraged this constant remembrance, stating, "may you maintain this remembrance; day and night may I also have this awareness; therefore I give this Vibhuti." The ash serves as a sign that the universe is pervaded by Maya (illusion), while Brahman alone is the ultimate, unchanging reality.