How did Sai Baba authorize the writing of his life story, and what conditions did He set for the author?

According to the narrative in Chapter 2, Sai Baba directly gave permission to create a collection of his stories and experiences, stating it was a good thing to do. He viewed the author as merely a pretext, declaring, "I myself shall write my own story!" The primary condition He set was for the author to completely dissolve their ego and surrender it at His feet. To anyone who could achieve this, Baba promised his full assistance, not just for the story but in all aspects of their life. He assured that when the ego is gone, He himself enters with 'I-ness' and writes with His own hand, making the author a mere instrument.