Why does the author invoke Goddess Saraswati in Chapter 1, and how is she connected to Sai Baba?

In Chapter 1 of the Shri Sai Satcharitra, the author invokes Goddess Saraswati, the daughter of Brahma, because she is the goddess of speech, knowledge, and literature. The author humbly asks her to make his tongue her swan and ride upon it, acknowledging that without the grace of the 'Mother of the World,' no literature can be achieved. This invocation is a plea for the ability to write the book effectively. As described in this chapter, Sai himself is also equated with Goddess Saraswati. The text beautifully illustrates this by saying, 'Sai himself is Goddess Saraswati, holding the Omkara-veena in hand, singing his own life story for the salvation of his devotees.'