Can you explain the 'Satya-Sai vow' that the Patil started, as described in this chapter?

The 'Satya-Sai vow' was a new tradition started by the Patil out of immense gratitude for his miraculous healing. As detailed in Chapter 13, this practice was modeled on the common Satyanarayan vow, which people undertook to overcome crises. On Thursdays, the Patil would perform this vow after bathing. Instead of reading the traditional Satyanarayan story, he would read the three chapters about Sainath from the 'modern Bhaktalilamrut' written by Das Ganu. He considered these chapters to be the 'Satya-Sai story' and saw no difference between the grace of Narayan and that of Sai.