What was Sai Baba's role in the writing of his own life story, as he explained it to the author?

In Chapter 2, Sai Baba described his role in the creation of his biography as being the true author, using the writer as an instrument. When the author sought permission, Baba granted it and promised his full help. He then revealed, "He is merely a pretext; I myself shall write my own story!" Baba instructed the author to dissolve his ego and surrender it at his feet, promising that for one who acts this way, He would provide full assistance. He stated that once the ego is gone, He himself would enter with "I-ness" and write with his own hand, making the human author just a pretext for the work.