Describe the evidence of Sai Baba's omniscience as demonstrated in his interactions with Damu Anna regarding the business proposals.

Chapter 25 provides clear evidence of Sai Baba's omniscience through his interactions with Damu Anna. Firstly, when Anna merely had a hidden thought about a business partnership, Baba gave a "manifest answer" by stating, "We are not in anything (partnerships), Bapu," proving he knew Anna's unspoken intentions. Secondly, when a new thought about trading grain arose in Anna's mind, Baba immediately responded with a prophetic warning about loss: "You will buy five seers and give seven seers." The text emphasizes this ability by stating that the past, present, and future are like an amla fruit on His palm, and He cautions His devotees at the right time to ward off calamities.