Can you summarize the main themes and stories presented in Chapter 22 of the Shri Sai Satcharitra?

Chapter 22 begins with a deep philosophical invocation, describing Sai Baba as the supreme purifier and the destroyer of worldly fears using the analogy of a snake and a rope to explain illusion and reality. As detailed in the chapter, the focus then shifts to the profound significance of Baba's feet, which are a source of happiness and fulfillment for devotees. A key story illustrates this point: when Das Ganu wished to bathe at the holy confluence of Prayag, Baba declared his own big toe to be Prayag. Miraculously, when Das Ganu placed his head at Baba's feet, the waters of the Ganga and Yamuna rivers manifested from his toe, fulfilling the devotee's desire.