What was the context and meaning behind Sai Baba's statement, "only those whose digestion is strong should eat onion," as mentioned in Chapter 23?

In Chapter 23 of the Sai Satcharitra, this statement was made in response to the unspoken doubt of a visiting Yogi. This Yogi, a practitioner who had studied the scriptures but could not attain Samadhi, came to Baba for help. However, his faith faltered when he saw Baba eating stale bread with a raw onion. He thought, "How can this man remove my doubts?" As this chapter narrates, Sai Baba, being omniscient, immediately understood the Yogi's inner turmoil. His comment, "Nana, only those whose digestion is strong should eat onion," was a direct, metaphorical response. It implied that only a spiritually advanced person, a true Guru, could "digest" or transcend worldly appearances and actions that might seem inappropriate to a conventional observer. The remark startled the Yogi into realizing Baba's omniscience, causing him to surrender his doubt and ego.