After being cured by Sai Baba, how did the Patil express his gratitude and devotion on a regular basis?

Following his miraculous healing, the Patil's devotion to Sai Baba became profound and structured. Chapter 13 explains that after staying in Shirdi for a month, he began to visit frequently, his heart overflowing with joy and gratitude. He innovated a new form of worship called the 'Satya-Sai vow,' which he performed every Thursday after bathing. This vow was his way of expressing gratitude, similar to how others performed the Satyanarayan vow for deliverance from troubles. The text emphasizes that Sainath desires nothing more than such faith, surrender, and gratitude.