How did Sai Baba's behavior and the reverence he received challenge the rigid caste system and concepts of ritual purity, as explained in Chapter 7?

As detailed in Chapter 7, Sai Baba fundamentally challenged societal norms around caste and purity through his actions and the devotion he inspired. He was considered beyond any caste distinction, whether Shudra or outcaste, as he had no ego regarding his body. This is powerfully illustrated by the fact that the most elite Brahmins and keepers of sacred fires (Agnihotris) would abandon their pride in ritual purity and prostrate before him. Furthermore, his own mind felt no disgust or impurity, even if a dog were to put its mouth in the food, showing his complete transcendence of such worldly distinctions.