What was the primary purpose of telling the story about Das Ganu's doubt, and what happened when Ganu went to Shirdi?

The author explicitly states the purpose of this narrative in Chapter 20. The intention is to show listeners 'how the Maharaj provide the solution without even speaking' when a devotee encounters a difficult passage while reading a book. The story serves to demonstrate the subtle and powerful ways a Guru works. After Ganudas completed his commentary, a specific doubt remained that even great scholars could not resolve. In need of a solution, he went to Shirdi to have Sai Baba's darshan. Upon arriving, he placed his head on Baba's feet and felt immense happiness. He began a conversation with Baba, alluding to the 'snag' in his work, which he felt Baba himself had orchestrated, setting the stage for the doubt's eventual resolution.