Can you provide a summary of Chand Patil's story and his connection to Sai Baba as described in the text?

Chand Patil was suffering from a disease and great sorrow, but upon encountering Sai Baba, his illness completely vanished. As detailed in Chapter 13, he felt as though he had been reborn and was overcome with an ocean of joy. Overwhelmed with gratitude for this inconceivable favor, he placed his forehead on Baba's feet. To express his devotion, he stayed in Shirdi for a month and later started a new tradition called the 'Satya-Sai vow,' which he performed regularly on Thursdays, reading chapters about Sai's life written by Das Ganu. This practice brought him immense happiness and became a custom in his village.