How did Sai Baba demonstrate his omniscience to his devotee Cholkar?

Sai Baba demonstrated his omniscience to Cholkar in a profoundly personal way, as narrated in Chapter 15. After Cholkar had fulfilled his long-delayed vow and was a guest of Jog, Baba told Jog, 'Give him cups of tea, well-filled with sugar.' This specific instruction amazed Cholkar, who had secretly given up sugar as a personal sacrifice until he could complete his pilgrimage. Baba later confirmed that this was a deliberate act to show Cholkar that his secret vow, the delay, and his private penance were all known to Him. Baba stated, 'Though you kept these secret, all of it is known to me,' thus proving that He is always with His devotees, aware of their innermost thoughts and actions.