Can you elaborate on the story of the author's friend in Lonavala and its significance as mentioned in the text?

Chapter 2 recounts a pivotal event that influenced the author. On the very day he was supposed to depart for Shirdi, his mind changed after hearing about his close friend in Lonavala. This friend's only son, who was healthy and virtuous, suddenly fell ill with a fever. Despite trying all human remedies and even having a Guru sit by the son's side, the child ultimately passed away. This tragic event, where even the physical presence of a Guru could not prevent the death, served as a stark example of the limits of human and even spiritual intervention against a seemingly preordained outcome. For the author, who was driven by logic and cynicism, this difficult situation likely challenged his worldview.