Why does the author of the Sai Satcharitra invoke Goddess Saraswati in Chapter 1, and what is her significance?

The author invokes Goddess Saraswati in Chapter 1 because she is revered as the Goddess of Speech and the Mother of the Vedas, without whose grace literature cannot be created. The author humbly asks her to make him an instrument to share the nectar of Sai's life with everyone. As described in the chapter, she holds the 'Brahma-veena' and rides a swan. The text then beautifully connects her to Sai by stating that 'Sai himself is Goddess Saraswati,' who sings his own life story through the 'Omkara-veena' for the salvation of his devotees.