According to the first chapter, why is Goddess Saraswati invoked, and how is she also identified with Sai Baba?

In Chapter 1, the author invokes Goddess Saraswati, recognizing that without the grace of the Goddess of Speech, no literary work can be accomplished. She is described as holding the Brahma-veena, riding a swan, and being the Mother of the Universe and the Vedas. The author prays for her to be the instrument to share the nectar of Sai's life. Following this, the text illustrates a non-dual concept by stating, 'Sai himself is Goddess Saraswati, holding the Omkara-veena in hand, singing his own life story for the salvation of his devotees.' This shows that Sai is both the subject of the book and the divine inspiration behind it.