How did Sai Baba demonstrate his omniscience regarding Laxmichand's physical discomfort and hunger?

Chapter 28 details a powerful instance of Sai Baba's inner knowledge. Laxmichand was suffering from both hunger and back pain, making him feel very restless. At that very moment, Sai Baba voiced the man's inner turmoil by saying, "Hunger has come, that's good. There should be medicine for back pain. Now the wind of khaja has blown; do the arati quickly." The text describes this as an "echo without sound," where Baba perfectly verbalized what was in Laxmichand's mind, proving that even unspoken thoughts and physical ailments were clearly known to Maharaj.