What is the significance of the Guru, specifically Sai Baba, as described in the philosophical invocation of Chapter 26?

According to Chapter 26, the Guru's role is paramount and indispensable for spiritual liberation. The text explicitly states that "only the Guru is capable of granting the knowledge of Truth to a disciple." The author prays to Sai Baba, the Sadguru, to make his intellect turn inward and bestow upon him the ability to discriminate between the eternal and the temporary. The chapter explains that the light of non-dual bliss shines forth through the "Great Sayings (Mahavakyas) of the Sadguru." The author's prayer, as detailed in Chapter 26, is a testament to the Guru's central function in helping a disciple overcome ignorance and realize the Self, which is why he places unshakeable faith in the Guru's words.