How did Sai Baba demonstrate his omniscience in the incident involving Mrs. Gokhale's planned fast?

Sai Baba's omniscience was clearly shown in the events surrounding Mrs. Gokhale's visit, as described in Chapter 32. The text states that the "inner witness Maharaj already knew" about her firm resolve to fast for three days before she even came to Shirdi. More concretely, he made a predictive statement to Dada Kelkar, asking, "In this Shimga (Holi) festival, will my children remain hungry? How can I let them remain so?" This occurred before Mrs. Gokhale's arrival, foretelling his intervention. The narrative explicitly confirms this divine quality by stating, "Whatever is in anyone's heart, Sainath knows everything," showing that her secret intention was completely transparent to him.