Which specific chapter details the evolution of Maharaj's healing methods from medicine to Udi?

Chapter 0 explains the progression of Maharaj's healing practices. Initially, he would give people medicines free of charge and would even personally care for patients if they were not being looked after properly. The text states, "Later, Maharaj stopped giving medicine and gave only Udi, i.e., ash." Maharaj confirmed this change himself to the author, whom he called Kaka, explaining that he stopped giving medicine and started chanting 'Hari Hari', and in doing so, he met Hari. This shift from physical medicine to spiritual remedies like Udi is a key development described in this introductory chapter.