What was Sai Baba's teaching on oneness and how did he illustrate it to the lady who fed the dog?

Sai Baba's teaching on oneness is a central theme in Chapter 9. When a lady expressed confusion about how she could have possibly fed him, Baba explained that by giving bread to a hungry dog, she had indeed fed him. He clarified this profound concept by stating, "I have oneness with him." He expanded on this by saying he is also one with a pig, a cow, a cat, and even ants and flies. Baba declared, "He who sees me in all beings, know him to be the one I love." The ultimate instruction was to "renounce the sense of difference" as the truest form of worship. This powerful lesson, described as "supreme nectar," moved the lady to tears of joy, completely changing her understanding of service and devotion.