What evidence convinced Nanasaheb Chandorkar that Maharaj possessed deep knowledge, possibly of Sanskrit?

Nanasaheb Chandorkar became convinced of Maharaj's profound knowledge through direct interaction and teachings. Chapter 0 explains that Nanasaheb would engage with Maharaj through 'prostration, questioning, and service,' and Maharaj would advise him. A pivotal moment occurred when Maharaj delivered an explanation of a specific verse, 'Tadviddhi pranipatena pariprashnena sevaya...', which lasted for about an hour. The depth and length of this discourse left a strong impression on Nanasaheb, convincing him that Maharaj must have a very good command of Sanskrit. This, combined with their frequent, hours-long sessions filled with wisdom, solidified his belief.