In Chapter 23, a Yogi develops a doubt about Sai Baba. What specific action by Baba caused this doubt, and what were Baba's precise words in response?

The specific event that caused the Yogi's doubt is detailed in Chapter 23. When the Yogi came for darshan, he saw Sai Baba eating bread (bhakar) along with onions. Seeing Baba eating what he considered to be common food—stale bread and a dry onion—caused a strong misgiving to arise in his mind, making him question Baba's spiritual stature. As Chapter 23 narrates, Sai Baba, being omniscient, immediately perceived this internal doubt. He turned to Nanasaheb Chandorkar and said, "Nana, only those whose digestion is strong should eat onion. One who has the strength to digest it may eat onion freely." This profound and targeted remark revealed Baba's omniscience, startling the Yogi's soul and causing him to surrender with true devotion.