How did Sai Baba demonstrate his ability to know people's inner thoughts to a devotee named Laxmichand?

According to Chapter 28, a devotee named Laxmichand visited Shirdi and silently wondered if Baba's coughing was the effect of an evil eye. To his astonishment, when he came to the masjid, Sai Baba spoke this very thought aloud, asking, 'It seems someone's evil eye has struck me; Therefore this cough again and again causes distress to my life.' This incident revealed Baba's omniscience, proving that He dwells in everyone's heart. Overcome with awe, Laxmichand pleaded with folded hands for Baba's continued grace and protection, affirming that Baba's feet were his only refuge.