How did Sai Baba demonstrate his omniscience to his devotee Laxmichand in the Shri Sai Satcharitra?

Sai Baba demonstrated his omniscience, or inner knowledge, to Laxmichand on multiple occasions. Chapter 28 recounts how Laxmichand was suffering from hunger and back pain, and Baba, without being told, spoke aloud about the need for food and medicine for back pain. He then specifically mentioned the "wind of khaja," which was the sweet Laxmichand was craving. In another instance detailed in the same chapter, Laxmichand privately worried that Baba's cough during a procession was due to an "evil eye." The very next morning, Baba voiced this exact thought, proving to Laxmichand that he could perceive even unspoken mental concerns, acting as an "echo without sound."