What is the relationship between dissolving one's ego and receiving Sai Baba's grace, as explained in the context of writing his biography?

In Chapter 2, Sai Baba establishes a direct and crucial link between the dissolution of ego and receiving his divine grace and assistance. When commissioning the author to write his story, he explicitly stated, "He should dissolve his ego and surrender it at my feet." Sai elaborated that when the ego vanishes without a trace, He himself would "enter with 'I-ness' and write with my own hand." This shows that ego is the primary barrier to divine action. Surrender is not just a suggestion but a requirement for the devotee to become a pure instrument, or "pretext," through whom Sai Baba could accomplish his work and fulfill the devotee's wish.