How does Chapter 32 explain the necessity of a Guru's grace for acquiring knowledge?

According to Chapter 32, a Guru's grace is absolutely essential for attaining true knowledge, rendering all other efforts incomplete without it. The text explicitly states that even if one has thoroughly studied the Vedas, Vedangas, and other scriptures, this learning is considered "mere chaff" if the Guru's grace is absent. The chapter emphasizes that the words from Sai Baba's mouth, which are about to be narrated, can help a person see their own Guru. This underscores the core teaching in Chapter 32 that spiritual realization is not possible through scholarly pursuit alone but requires the indispensable blessing of a Guru.