Why do avatars like Sai Baba take birth if they are already the Supreme Brahman and beyond the cycle of birth and death?

Chapter 43 explains that the incarnation of great souls and avatars is a voluntary act undertaken for a specific, benevolent purpose. The text states that they appear 'with the sole desire for the welfare of devotees' and for 'the sake of the devotees’ protection.' These beings, who are the personification of Brahman, are essentially 'beyond the womb' and are not subject to the states of birth and death like ordinary beings. Their purpose is to help others and gather people for their spiritual upliftment. As Chapter 43 clarifies, 'When the task is over, they join their true form and merge into the unmanifest.' Their appearance in a physical form is a deliberate choice for the benefit of humanity.