The author feels he lacks the ability to describe Sai Baba's greatness. What metaphors does he use to explain how Guru's grace overcomes his perceived limitations?

In Chapter 3, the author uses several powerful metaphors to illustrate the concept of Guru's grace. He describes himself as a 'blind man' who is blind in the eyes of scriptural knowledge (Shruti and Smriti), but for whom Baba acts as a 'staff,' allowing him to walk the straight path step by step. He also references the inconceivable power of saints that allows 'the mute speak like Brihaspati; the lame cross Mount Meru.' To further explain how the work is Baba's and not his own, he uses natural imagery. As Chapter 3 explains, just as a moonstone oozes nectar not from itself but due to the moonrise, and the ocean's tide is a feat of the moon, his writing is a creation of Baba's power acting upon him.