Can you describe the specific moment and verse from the Bhagavad Gita that prompted Sai Baba to start teaching Nana Chandorkar?

The specific incident occurred while Nana Chandorkar was massaging Sai's feet and reciting the fourth chapter of the Bhagavad Gita, known as the Yoga of Renunciation of Action in Knowledge. As detailed in Chapter 39, Nana had just finished the 33rd verse, which states, 'All actions in their entirety, O Partha, culminate in knowledge.' He was beginning the 34th verse, which starts with 'Tadviddhi pranipatena,' when his recitation was paused. It was at this exact moment that Sai Baba intended to ask a question to impress the true teaching upon Nana, thus initiating their famous dialogue on the Gita.