How is Sai Baba's ultimate nature described in relation to his physical body and worldly phenomena like illness?

Chapter 43 describes Sai Baba's ultimate nature as the "complete Supreme Brahman" and a "mass of bliss," completely transcending the physical realm. The text emphasizes that he is "devoid of bodily impulses" and lacks the "consciousness of the body," viewing the world as an illusion. Because of this, physical and mental illnesses are irrelevant to his true self. Chapter 43 clarifies that even if any ailments appeared due to past karma, he would have no awareness of them. His physical actions were not mundane but a "spontaneous play of Yoga" for his devotees. Ultimately, he is portrayed as a being who fills the entire universe in his true form, having merged with Brahman, making the physical body a mere adjunct.