According to the preface, what distinguishes the Shri Sai Satcharita as a poetic work, and why is this important for readers?

The preface discussed in Chapter 0 categorizes poetic books into three types: natural, graceful (Prasadik), and artificial. It explains that a book written solely on scholarship and intelligence is considered artificial and will not last or inspire genuine faith. The Shri Sai Satcharita, in contrast, is described as a 'grace-filled' or 'Prasad-janya' book. This means it is believed to be created with the Guru's grace and divine gift, not just human intellect. This quality is considered essential for a spiritual book, as it is what allows the work to leave a lasting impression on seekers and foster faith and trust among devotees.