Can you explain the concept of the 'Satya-Sai vow' that the Patil started, as described in Chapter 13?

The 'Satya-Sai vow' was a tradition initiated by the Patil to show his gratitude and faith, as explained in Chapter 13. This practice was modeled after the traditional Satyanarayan vow. On every Thursday, after bathing, the Patil would read the three chapters dedicated to Sainath from Das Ganu's book, 'Bhaktalilamrut.' This reading was considered the 'Satya-Sai story.' The Patil treated this vow with the same reverence as the worship of Narayan, seeing no difference between Narayan and Sai. This devotional practice, which included offerings and celebrations, became a custom in his village.