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

Nanasaheb Chandorkar became convinced of Maharaj's profound wisdom after a particular teaching session. The source material in Chapter 0 recounts that Nanasaheb engaged in questioning and service, and in return, Maharaj advised him. During one of these sittings, Maharaj delivered an explanation of a Sanskrit verse, 'Tadviddhi pranipatena pariprashnena sevaya...', that lasted for about an hour. The depth and duration of this discourse on a single verse convinced Nanasaheb that Maharaj must possess a very high level of knowledge in Sanskrit, solidifying his reverence for Maharaj's wisdom.