Could you elaborate on Sai Baba's transition from administering medicine to giving Udi, and his own explanation for it?

Initially, Sai Baba was known for giving medicine to people, a service he provided for free. He would even nurse patients himself if they were neglected. However, he later stopped this practice and began giving only Udi (ash). Chapter 0 provides his own words on this shift. He explained to a writer whom he called Kaka, "I used to give medicine to people before. Later, I stopped giving medicine and started saying 'Hari Hari', and while saying Hari Hari, I met Hari." This suggests a spiritual evolution where his focus shifted from physical remedies to a path centered on divine name and grace.