What did the narrator perceive as the hidden meaning or grace in Shama telling him the story of the old woman?

The narrator perceived a deeper, divine intervention in the act of hearing the story from Shama. He explicitly stated to Baba, "While Shama was telling that story, your inscrutable nature became apparent; as if on the pretext of that story, you have certainly bestowed grace upon me." As described in Chapter 19, the narrator didn't see it as a mere anecdote. He believed that Baba had orchestrated the event to guide him. This feeling was confirmed for him when hearing the story resolved his inner turmoil, causing him to exclaim that the "yearning of my mind is gone, and I have certainly understood the path."