How does the story of the incense ash illustrate the spiritual principle behind Sai Baba's Udi?

The narrative in Chapter 33 about Narayanrao's friend powerfully illustrates the spiritual principle of Udi. When faced with a scorpion sting and no Udi, Narayanrao used ordinary ash from burnt incense sticks found near Baba's picture. The text emphasizes that he consciously "considered it as Udi in that moment." By applying this ash with faith and chanting Sai's name, the friend was instantly cured. This experience demonstrates that the healing power was not solely inherent in the physical Udi from the Dhuni, but was activated and manifested through the devotee's profound faith, feeling, and connection to Sai. The ash became a conduit for grace because it was treated as such.