Can you explain the origin and practice of the 'Satya-Sai vow' as detailed in the latter part of Chapter 13?

The 'Satya-Sai vow' is a tradition started by the Patil as an act of devotion, detailed in Chapter 13. He drew a parallel to the common practice of vowing to perform a 'Satyanarayan' puja to overcome a crisis. The Patil adapted this by creating a vow dedicated to Sai. On Thursdays, he would perform the 'Satya-Sai vow,' which involved reading the three chapters about Sainath from the 'modern Bhaktalilamrut' written by Das Ganu. The Patil considered these chapters to be the 'Satya-Sai story.' This practice, which included offerings and celebrations and was performed with a joyful mind, became a custom in his village, based on the belief that 'There it is Narayan, here it is Sai; there is no difference in either.'