Can you explain the origin and practice of the 'Satya-Sai vow' as described in the text?

The 'Satya-Sai vow' was a tradition started by the grateful Patil mentioned in Chapter 13. After being miraculously cured, he wanted to show his devotion. In a manner similar to how people would perform a Satyanarayan vow to overcome a crisis, the Patil began performing the Satya-Sai vow. Every Thursday after bathing, he would read from the 'modern Bhaktalilamrut' written by Das Ganu. Specifically, he would read the three chapters dedicated to the character of Sainath, which he considered the 'Satya-Sai story.' This practice, which included offerings and celebrations, brought him boundless happiness and peace, and it eventually became a custom in his village.