How did Sai Baba reveal Sapatnekar's life story to him in a miraculous way?

When Sapatnekar was feeling sleepless and dejected, he approached Baba when He was alone and held His feet. At that time, a Dhangar (shepherd) woman also came and sat to massage Baba's waist. As detailed in Chapter 48, Baba began a conversation with her, but Sapatnekar was astonished to find that every word of it was actually his own life story. Although the story was ostensibly about a merchant (Wani), it detailed Sapatnekar's life in its entirety, even mentioning the death of his late son. This leela made Sapatnekar realize the depth of Baba's omniscience, as he heard his own history being narrated from Sai's mouth to a woman who had no connection to it.