What does it mean when the Satcharita says Sai Baba is the 'complete Supreme Brahman' and that the world is an 'illusion' to him?

When Chapter 43 describes Sai Baba as the "complete Supreme Brahman," it signifies his true nature as the ultimate, formless, and eternal reality. This status places him beyond all dualities, including birth and death, and physical limitations. The statement that "the world is an illusion" for him is a reflection of this non-dual perspective. It means that due to his firm grounding in the truth of Brahman, he is not bound by the transient and illusory nature of the material world or the consciousness of having a body. As Chapter 43 clarifies, saints are personifications of Brahman who incarnate for the welfare of people, and their actions, like wandering in an invisible form, are a "spontaneous play of Yoga for the sake of the devotees' salvation."