How did Sai Baba demonstrate his omniscience to Laxmichand, and what was the result?

Chapter 28 details a remarkable instance of Sai Baba's omniscience concerning his devotee, Laxmichand. On one occasion, Laxmichand was feeling both hungry and was suffering from back pain. As described in the scripture, Baba, without being told, voiced Laxmichand's exact troubles, saying "Hunger has come, that's good. There should be medicine for back pain." He also mentioned the specific food, khaja, that he had earlier requested and which Laxmichand desired. This event, where Baba echoed Laxmichand's inner thoughts, is highlighted in Chapter 28 as an "Echo without sound." The result was profound; Laxmichand's desire was fulfilled after the arati, and his love and devotion for Baba became firmly fixed from that day forward.