How does the incident with the Yogi and the onion in Chapter 23 demonstrate Sai Baba's omniscience and unique teaching style?

The story of the Yoga practitioner in Chapter 23 serves as a powerful example of Sai Baba's omniscience and teaching methods. When the Yogi, an expert in scriptures, visited, he was filled with a strong misgiving upon seeing Baba eating bread and onions. As detailed in the chapter, Sai Maharaj, being omniscient, immediately perceived the unspoken doubt in the Yogi's mind. His response, "Nana, only those whose digestion is strong should eat onion," was not a literal dietary comment but a profound spiritual metaphor aimed directly at the Yogi's intellectual pride and inability to "digest" the reality of a saint's state being beyond external appearances. This startled the Yogi into surrendering his ego and opening his heart to Baba's grace.