How does the incident with Damu Anna's letter suggest Baba's omniscience?

The narrative in Chapter 25 strongly suggests Sai Baba's omniscience. Before Shama even read Damu Anna's letter, Baba commented on its contents, asking, "What plans is he making?" and stating, "It seems he is trying to touch the sky! He doesn't want what God gives." Shama was astonished, confirming that Baba's words were the exact meaning of the letter, literally Damu Anna's thoughts. This interaction, where Baba knew the "inner intent" without needing the physical act of reading, is presented as a demonstration of his ability to perceive the thoughts and desires of his devotees from afar.