How did the narrator's experience of retelling a story to Sai Baba lead to a profound spiritual lesson?

The narrator's experience, detailed in Chapter 19, shows a progression from a simple event to a deep spiritual teaching. It began when he mentioned to Baba how a story about an old woman, told by Shama, revealed Baba's inscrutable nature and felt like a bestowal of grace. After Baba had him retell the story, He confirmed its importance, telling the narrator to keep it in his heart. This act of listening and affirming the narrator's feeling opened the door for a direct teaching. Baba then pivoted from the story's impact to the underlying spiritual practice required for such realization, launching into a discourse on meditation, the nature of consciousness, and the power of a Guru's grace, exemplified by the 'tortoise-vision' analogy. The entire episode demonstrates how Baba used a devotee's personal experience as a perfect, timely catalyst for imparting profound wisdom.