What is the core message about impermanence that Sai Baba conveys through the Udi in Chapter 33?

The core message about impermanence conveyed through the Udi in Chapter 33 is that the material world and our physical forms are fundamentally transient. The chapter explains that Baba used the sacred ash to teach a powerful lesson. The Udi signifies that 'all this visible universe is nothing but ash.' Baba's teaching, as narrated in the chapter, extends this metaphor to the human body, which is described as 'wood made of five elements.' It exists to experience its destined enjoyments, and once those are exhausted, it becomes motionless and turns to ash. By giving this Udi, Baba was encouraging a constant awareness ('day and night may I also have this awareness') of this impermanence, urging devotees to look beyond the illusory world of Maya to the eternal truth of Brahman.