How did Sai Baba demonstrate his omniscience through the daily scriptural readings in the Wada?

Sai Baba had a profound and skillful way of bestowing grace, often demonstrating his all-knowing nature through the daily readings. According to Chapter 18, a fascinating phenomenon would occur where Baba, while sitting in the Masjid, would tell a visitor a short story. He would then immediately send that person to the Wada where Bapusaheb Jog was conducting the daily reading. Upon arriving, the sincere listener would discover that the exact same story Baba had just told was coincidentally appearing in the book being read, providing confirmation and a full understanding of Baba's lesson. This was considered a great wonder by the devotees.