What is the philosophical meaning of birth and death according to the teachings in the Sai Satcharita?

Chapter 43 explains that birth is simply the union of the body and senses, while death is their separation. These two concepts are described as inseparable from each other. However, for great souls who incarnate by their own will purely for the welfare of devotees, birth and death are considered false imaginations. The text states that for someone who, through spiritual practice, has turned their body to ashes even before it physically falls, death holds no fear and is like dust before them. In this higher context, death is viewed as the nature of the body and even a state of happiness for it, while life is seen as a modification of the body.