How did Sai Baba reveal his omniscience to a devotee named Laxmichand?

As recounted in Chapter 28 of the Shri Sai Satcharitra, a devotee named Laxmichand privately thought that Baba's persistent cough might be the effect of an evil eye. The very next morning, without any prompting, Baba voiced this exact thought aloud, saying, "It seems someone's evil eye has struck me; Therefore this cough again and again causes distress to my life." This incident caused Laxmichand to wonder how Baba could know his private thoughts, leading him to the realization that Baba dwells in everyone's heart and is all-knowing. This profound experience deepened his faith immensely.