Describe the primary condition Sai Baba required the author to meet in order to receive his full assistance in writing the 'Sai Leela' book.

The fundamental condition that Sai Baba set for the author is detailed in Chapter 2. To receive Sai's complete help, the author had to completely let go of his personal identity and pride. Baba's words were direct: "He should dissolve his ego and surrender it at my feet." He promised that for one who acts this way in life, He would give full assistance not just for the book, but in all ways. Baba further explained that when the ego is dissolved without a trace, "Then I myself shall enter with 'I-ness' and write with my own hand." This act of surrender was essential for the author to become a pure instrument, or pretext, for Sai Baba to write His own story.