How did Sai Baba's actions and teachings address the concepts of caste and ritual purity?

Chapter 7 illustrates that Sai Baba completely disregarded distinctions of caste and conventional notions of ritual purity. The text states that for him, caste did not matter 'even in the slightest degree,' and he was the same to all, whether they were Shudra or from an outcaste community. A powerful example of this is that the 'best of Brahmins' and Agnihotris (keepers of sacred fire) would abandon their pride in ritual purity and prostrate before him. His indifference to purity rules is further shown by the detail that his mind felt no disgust even if a dog were to put its mouth into the food, demonstrating he had no ego regarding the body or its defilement.