What was Sai Baba's specific response to the Yogi who doubted him for eating onions, and what is the underlying lesson from this interaction in Chapter 23?

When the practitioner of Yoga saw Sai Baba eating stale bread and dry onion, he thought, 'How can this man remove my doubts?' As detailed in Chapter 23, Sai Baba, being omniscient, immediately addressed this unspoken thought by saying, 'Nana, only those whose digestion is strong should eat onion. One who has the strength to digest it may eat onion freely.' The underlying lesson from this powerful interaction is that one cannot understand the true state of a saint by their external behaviors, such as what they eat. It served as a direct demonstration of Baba's omniscience, as He read the Yogi's mind. This startled the Yogi into surrendering his pride and doubt, ultimately allowing him to receive Baba's grace and attain peace.