The text mentions Sai being both formless and with form. Can you explain what this means according to Chapter 30?

Chapter 30 of the Sai Satcharitra explains the dual nature of Sai Baba. Initially, He resides in a formless state, referred to as "Nirguni." However, it is through the power and qualities of his devotees' devotion that He is drawn into a form with attributes, or "Saguni." This transition from the formless to the tangible form is a testament to the profound connection between Sai and his followers, where their devotion gives shape to the divine. As the chapter states, He is the crest-jewel among saints who takes on form for the sake of His devotees, who crave his words and darshan.