Describe the "Satya-Sai vow" that the Patil started. What did the practice involve and what was its origin, according to Chapter 13?

The "Satya-Sai vow," as detailed in Chapter 13, was a tradition initiated by the Patil to express his profound gratitude for being cured. It was modeled on the common practice of vowing to perform a Satyanarayan puja. The Patil's version, however, was dedicated to Sai. The ritual involved performing the vow on Thursdays after bathing. Instead of the traditional Satyanarayan story, the Patil would lovingly read the three chapters about Sainath from Das Ganu's book, the "Bhaktalilamrut." This practice, which brought him boundless happiness and peace, equated Sai with Narayan and became a customary recitation in his village, demonstrating a new form of devoted worship.