How did Sai Baba manage to change the mind of a man who was determined not to bow to him?

The story in Chapter 35 details a powerful incident. A friend of Kaka Mahajani, who was against idol worship, had firmly resolved not to bow to Sai Baba. When this man set foot in the mosque, Baba saw him and spoke. The miracle was in the sound of Baba's voice; he used a tone and style that was a perfect imitation of the friend's deceased father. Hearing words that sounded exactly like they came from his father's mouth caused the man to be utterly amazed and emotionally overwhelmed. This profound experience made him forget his prior conviction, and he immediately bowed his head at Baba's feet.