What is the significance of Udi as described in the Shri Sai Satcharitra?

According to Chapter 34 of the Shri Sai Satcharitra, the significance, or glory, of Udi is immense and is presented as a central theme. Udi is not merely ash; it is a substance imbued with Sai Baba's divine healing power. The chapter emphasizes its miraculous qualities by stating that it can cure even the most terrible and seemingly incurable diseases. As an example, the text mentions that a severe condition like a bone-cyst (Hadyavran), which resisted all other remedies, was completely uprooted and the pain eliminated by simply smearing it with Udi from Sai's hand. This illustrates that Udi's importance lies in its ability to provide physical and spiritual relief where all other efforts have failed, serving as a tangible symbol of Sai's grace and protection.