How did Sai Baba's actions demonstrate his transcendence of caste distinctions and conventional ideas of purity?

Chapter 7 provides powerful examples of how Sai Baba transcended all social barriers of caste and purity. The text states that the "best of Brahmins" and even "Keepers of the sacred fire (Agnihotris)," who are typically very strict about ritual purity, would abandon their pride and prostrate before him, showing that his spiritual stature superseded any caste considerations. Furthermore, his complete lack of ego regarding the body is highlighted by the observation that he felt no disgust even if a dog were to put its mouth into the food shared among the Fakirs. For Baba, as Chapter 7 explains, caste "did not matter even in the slightest degree."