Can you elaborate on Sai Baba's philosophical explanation of His true nature beyond His physical body?

Chapter 3 provides a profound explanation of Sai Baba's true form. He guided the author to understand that the "Sai's body is perishable; the Brahman is imperishable and worthy of worship." Baba explained that His true self is not the physical form but the omnipresent Brahman. He described Himself as being filled everywhere in the form of the eightfold nature (Ashtadha-prakriti), a concept He likened to the Lord's discourse to Arjuna in the Gita. He stated, "Whatever has name, form, or shape... I alone am playing as the eightfold nature."