Describe the tragic event involving the author's friend that made him reconsider his visit to Shirdi.

As detailed in Chapter 2, on the very day the author was set to depart for Shirdi, his mind suddenly changed due to a tragic event concerning a close friend. This friend, the son of a Guru, was in Lonavala with his wife when his only son, who was healthy and virtuous, was suddenly stricken with a fever. Despite trying all human remedies and divine rituals, including having the Guru himself sit by the boy, the son ultimately passed away. Witnessing this terrible crisis and the failure of even a Guru's presence to prevent it caused the author to hesitate about his own spiritual journey to Shirdi.