What event convinced Nanasaheb Chandorkar of Maharaj's deep knowledge of Sanskrit?

Nanasaheb Chandorkar became convinced of Maharaj's profound wisdom and knowledge through their personal interactions. The source material in Chapter 0 describes how Nanasaheb, a government official, would often have long sittings with Maharaj. During one of these sessions, Maharaj provided a detailed explanation of a specific Sanskrit verse, "Tadviddhi pranipatena pariprashnena sevaya...", speaking on it for about an hour. This extensive and insightful discourse left a powerful impression on Nanasaheb. As Chapter 0 notes, it was from this explanation that Nanasaheb was utterly convinced that Maharaj must possess a deep and thorough knowledge of the Sanskrit language.