Can you explain the theological concept of the transition from 'Nirguni' to 'Saguni' as it is presented at the beginning of Chapter 30?

Chapter 30 introduces a profound theological concept regarding Sai Baba's manifestation. It explains that initially, Sai's true nature is formless, or 'Nirguni.' However, it is through the compelling force of his devotees' love and devotion that he is drawn into a manifest form with attributes, which is known as 'Saguni.' This description from the chapter beautifully illustrates that the physical presence of the Guru is not arbitrary but is a direct, compassionate response to the faith of the devotees, making the infinite and formless accessible to finite beings seeking a connection.