How did Sai Baba demonstrate his ability to know people's inner thoughts in the story of Laxmichand?

Sai Baba demonstrated his omniscience on multiple occasions with his devotee Laxmichand, as detailed in Chapter 28 of the Sai Satcharitra. First, when Laxmichand silently craved a sweet called khaja after having it once, Baba specifically requested that very sweet as a food offering the next day, fulfilling the devotee's unexpressed wish. Later, when Laxmichand was suffering from hunger and back pain, Baba's words directly addressed these ailments. On another occasion, Laxmichand privately thought Baba's cough might be due to an 'evil eye,' and the very next morning, Baba voiced this exact thought, leaving Laxmichand to wonder how Baba could know what was in his heart.