From a yogic perspective, what is the nature of birth and death, and how does it apply to Sai Baba?

Chapter 43 defines birth as the union of body and senses and death as their separation. However, for great yogis and avatars who incarnate for the welfare of devotees, these are considered false imaginations. Death is presented as a natural characteristic and a state of happiness for the body, while life is a modification. For Sai Samarth, who was devoid of bodily impulses, the spontaneous play of Yoga involved holding or releasing breath and wandering in an invisible form for the devotees' salvation. Having already turned his body to ashes in the fire of Yoga, he had no fear of death, which was like dust to him.