Explain the transition in Maharaj's healing methods from medicine to Udi as described in the source.

Maharaj's approach to healing evolved significantly over time. The introduction in Chapter 0 details that he initially provided conventional medicines to the sick, often going to great lengths to care for them himself, all without charge. However, there was a distinct shift in his methodology. He stopped giving out medicine and instead began to give only Udi, or sacred ash, from his dhuni. The text mentions that people would benefit from this ash as well. Maharaj himself explained this transition to the author, stating, as recorded in Chapter 0, "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."