What does the source material suggest is the deeper significance of Sai Baba's Udi, beyond just its physical healing properties?

According to the narrative in Chapter 33, the Udi is far more than a mere remedy; it is described as 'supremely auspicious.' The text explains that Sai Baba is the 'helmsman of the path of spiritual welfare,' and through the Udi, he bestows spiritual well-being while also fulfilling worldly interests. The story of Narayanrao using incense ash as a substitute for Udi highlights the core principle: the devotee's faith is the critical component that activates the healing power. This experience, where belief transformed ordinary ash into a potent cure, served to deepen devotion and make it unshakeable, revealing that the Udi's true purpose is to foster and solidify faith in the divine.