How does the narrative connect the principle of 'listening' to the specific interaction between Sai Baba and Nana Chandorkar regarding the Gita?

The text in Chapter 39 first establishes that purity of mind is the main tool for spiritual progress and that listening (Shravana) is the supreme form of devotion to achieve it. It then provides a living example of this principle. While Nana Chandorkar was humming the Gita, Sai Baba intervened, asking him to recite it clearly so it could reach His ears. This act transforms Nana's passive muttering into an active, conscious recitation directed at the Guru. Baba's subsequent request for the verse's meaning turns the scene into a lesson on listening with a quiet mind, showing how a Guru actively guides a devotee from mere recitation to deep understanding, thereby fulfilling the spiritual well-being promised through attentive listening.