Describe the philosophical explanation Sai Baba gave about his true, imperishable nature as opposed to his physical form.

As detailed in Chapter 3, Sai Baba explained that his physical body was perishable, but his true self was the imperishable Brahman, which is worthy of worship. He elaborated by stating, 'I am filled on all four sides in the form of the eightfold nature (Ashtadha-prakriti),' referencing the Gita's discourse to Arjuna. Baba declared his omnipresence, explaining that he is present in every object in the universe, both moving and unmoving. He taught that when a person truly understands 'Who am I' and realizes this all-pervading nature of the Self, where 'I' and 'mine' dissolve, all desires vanish like hail in the sun, because there is nothing separate from the Self to desire.