What specific verse from the Gita did Nana explain to Sai Baba, and what was the traditional interpretation he offered?

The verse Nana Chandorkar recited and explained is from the Bhagavad Gita, 4.34. Chapter 39 provides the original Sanskrit: 'Tadviddhi pranipatena, pariprashnena sevaya | Upadeksyanti te jnanam, jnaninastattvadarsinah.' Nana, who was an expert in various commentaries, provided the widely accepted meaning. He explained to Baba that Lord Krishna advises Arjuna that one can receive spiritual knowledge (jnanam) from the Wise who have seen the Truth (tattvadarsinah) by approaching them with prostration (pranipatena), asking sincere questions (pariprashnena), and rendering service (sevaya). This was the standard explanation supported by commentators like Shankara.