How did Sai Baba uniquely reveal his omniscience to Sapatnekar, who was feeling rejected?

Sai Baba revealed his all-knowing nature to Sapatnekar in a truly remarkable way. After being repeatedly rebuffed, a distressed Sapatnekar decided to seize an opportunity to hold Baba's feet when he was alone. As he was doing so, a shepherd (Dhangar) woman arrived and Baba began a conversation with her. Chapter 48 recounts that as Sapatnekar listened, he was stunned to realize that Baba was narrating his own life story in minute detail, even mentioning the death of his son. Although the story was ostensibly being told to the woman, every word was Sapatnekar's own history. This indirect yet deeply personal revelation demonstrated Baba's omniscience, leaving Sapatnekar in a state of wonder and cementing his faith.