Can you explain the philosophy of birth and death as described in the text, and how it applies to Sai Baba?

According to Chapter 43, birth is defined as the union of the body and senses, while death is their separation. For ordinary beings, death is an inseparable characteristic attached to birth. However, for great souls like Sai Baba, this concept is entirely different. The text explains that saints who incarnate by their own will, with the sole desire for the welfare of devotees, are not touched by birth and death, which are considered false imaginations. Sai Baba is described as the complete Supreme Brahman, for whom birth and death are non-existent. As Chapter 43 states, he is a mass of bliss who does not know the birth of the body, so how can there be death for it? His departure was a willed act of merging into the unmanifest, not a conventional death.