Can you explain the philosophical significance of Sai Baba being described as moving from 'Nirguni' to 'Saguni' in Chapter 30?

Chapter 30 presents a significant theological concept by describing Sai Baba's transition from 'Nirguni' (formless) to 'Saguni' (form with attributes). Philosophically, 'Nirguni' represents the ultimate, unmanifest, and attributeless divine reality, which can be difficult for the human mind to grasp. The chapter explains that it is through "the qualities of devotees' devotion" that this formless reality is drawn into a 'Saguni' form. The significance for devotees is immense: the abstract becomes concrete, the unknowable becomes knowable. This manifestation allows for a personal relationship with the divine, where devotees can direct their love and faith towards a tangible, compassionate being who, as the chapter states, actively works to uplift them and dispel their fears.