How did Sai Baba's omniscience play a role in the story of the Yogi who doubted him in Chapter 23?

Chapter 23 highlights Sai Baba's omniscience through his interaction with a visiting Yogi. This Yogi, who had mastered scriptures but not his own mind, developed a 'strong misgiving' when he saw Baba eating stale bread and onions, thinking to himself, 'How can this man remove my doubts?' The text states that Sai Maharaj, being omniscient, immediately knew of this internal doubt. He addressed it directly, though cryptically, by saying, 'Nana, only those whose digestion is strong should eat onion.' This comment proved Baba's ability to perceive the Yogi's innermost thoughts, which startled the Yogi and instantly cleared his doubt. This display of divine insight caused the Yogi to surrender with a 'doubt-free heart,' demonstrating that a saint's actions and knowledge are beyond ordinary comprehension.