According to Chapter 43, why do great souls like Sai Baba incarnate on Earth if they are beyond birth and death?

Chapter 43 explains that great souls like Sai Baba, who are beyond the cycles of birth and death, choose to incarnate on Earth for a specific, selfless reason. The text repeatedly emphasizes that their purpose is the 'welfare of devotees' and the 'welfare of people.' These beings, described as personifications of Brahman, appear 'for the sake of helping others' and for the protection of their followers. Sai Baba's appearance in Shirdi is attributed to the 'past merits of devotees.' Once their designated task for the devotees is complete, they are not subject to death but simply merge back into their 'true form' in the unmanifest, their incarnation having served its purpose of guiding and gathering people.