How did Sai Baba prove his inner knowledge, or omniscience, to Laxmichand on multiple occasions?

Sai Baba demonstrated his omniscience to Laxmichand through several incidents detailed in Chapter 28. Firstly, when Laxmichand was silently craving a sweet called khaja, Baba, without being told, specifically requested that very sweet for the daily offering, thus fulfilling the devotee's unexpressed desire. Secondly, when Laxmichand was suffering from hunger and back pain, Baba's words directly mirrored his condition, stating, 'Hunger has come, that's good. There should be medicine for back pain.' Later, when Laxmichand privately thought Baba's cough might be due to an 'evil eye,' Baba himself repeated this exact thought the next morning, making Laxmichand wonder how Baba could dwell in everyone's heart.