If saints are beyond the physical world, why do they take avatars and appear to undergo birth and death?

According to the explanation in chapter 43, saints are indeed free from the cycle of birth and death, which they perceive as an illusion. They are described as always remaining in an unmanifest state, free from worldly changes. However, they choose to incarnate by their own will with the "sole desire for the welfare of devotees." Chapter 43 states that they "become manifest for the salvation of devotees" and take on the "task of the avatar for the people." Therefore, their engagement with the physical world, including the appearance of birth and death, is a form of divine play or 'lila' undertaken not out of compulsion but out of compassion to guide and uplift humanity.