How did Sai Baba teach Nana Chandorkar about the path to acquiring spiritual knowledge?

In an incident described in Chapter 39, Sai Baba used a verse from the Bhagavad Gita to teach Nana Chandorkar about acquiring spiritual knowledge. Baba had Nana recite a verse he was humming and then asked for a detailed explanation. Nana explained the traditional meaning: that one attains knowledge by prostrating at the Guru's feet, serving the Guru, and asking respectful questions. The Wise ones who have seen the Truth will then impart this knowledge. This dialogue, initiated by Baba, was intended to impress the true teaching upon Nana, demonstrating the importance of humility, service, and sincere inquiry on the spiritual path.