According to Chapter 20, what is the fundamental nature of Sai Baba and his purpose?

Chapter 20 explains that Sai Baba is fundamentally a formless, divine entity who chose to take on a physical form for the benefit of his devotees. The text uses a metaphor, stating that he accepted "the role of the actress 'Maya,'" suggesting he masterfully played a part in the material world to guide others. His purpose, as described in Chapter 20, is to provide a refuge for all and end the cycle of rebirth for his followers. His very presence is described as a "Siddhashram" (abode of the perfected) where the fatigue of worldly life is relieved and the "delusion of existence" is driven away for those who are close to him.