Can you explain the philosophical concept of Sai moving from 'Nirguni' to 'Saguni' as detailed in Chapter 30?

Chapter 30 of the Sai Satcharitra presents a deep philosophical insight into Sai Baba's divine nature. It explains that fundamentally, Sai exists as "Nirguni," or the formless, absolute reality. However, the chapter beautifully articulates that through the compelling power and pure qualities of a devotee's devotion, this formless divine is drawn into a "Saguni" state—a form with attributes that can be perceived and worshipped. This teaching, as mentioned in Chapter 30, suggests that the Supreme manifests in a tangible form for the sake of the devotees, responding directly to their love and faith, establishing Sai as the 'crest-jewel among saints' for embodying this principle.