What is the ultimate conclusion of the author in Chapter 53 regarding the source of his ability to write the concluding summary?

In the introductory section of Chapter 53, the author resolves his feelings of inadequacy by completely surrendering to a higher power. After praying to Dattaguru and Sai-Narayana for compassion, he concludes that he is merely an instrument for the divine will. He states that Sai himself, referred to as the 'breaker of obstacles (Vakratunda),' will be the one to actually write the summary. The author's role is simply to be a conduit, as he explicitly says, 'His glory is immense; my mouth is merely an instrument.' This act of surrender allows him to proceed with the task, attributing all credit and ability to the Guru.