Can you explain the Gita verse that Nana Chandorkar recited to Sai Baba and the meaning he provided?

The verse Nana Chandorkar recited, as detailed in Chapter 39, is from the Bhagavad Gita (4.34): "Tadviddhi pranipatena, pariprashnena sevaya | Upadeksyanti te jnanam, jnaninastattvadarsinah." Nana, being an expert in Gita commentaries, explained its meaning to Sai Baba. He conveyed that Lord Krishna instructs Arjuna that true knowledge is obtained from the Wise who have seen the Truth. The process involves prostrating before the Guru, serving the Guru wholeheartedly, and asking sincere, respectful questions. Following this method of service and humility allows the Guru to instruct the disciple on the path of Knowledge. The text notes that Sai Samarth accepted the meaning of the first two lines of Nana's explanation.