Based on Chapter 30, what is Sai Baba's fundamental nature and how does it change in relation to his devotees?

Chapter 30 of the Sri Sai Satcharita explains that Sai Baba's fundamental nature is formless, or 'Nirguni'. However, the chapter beautifully describes how he is drawn into a form with attributes, or 'Saguni', through the power of his devotees' deep devotion and love. This transition is not a change in his essence but an act of grace to make himself accessible to his followers. The text refers to him as 'Karuṇālaya', an abode of mercy, whose darshan dispels the fear of worldly existence. Thus, as Chapter 30 illustrates, Sai's compassion for his devotees compels him to manifest in a tangible form from his original formless state.