The text mentions different types of poetic books. Why is Shri Sai Satcharita considered a 'grace-filled' or 'Prasadik' work, and what distinguishes it from other types?

According to the preface material in Chapter 0, poetic books are categorized as natural, graceful (Prasadik), or artificial. A book written solely on the strength of intellect and scholarship is considered artificial and will not last eternally or possess divine inspiration. The Shri Sai Satcharita, however, is described as a 'grace-filled (Prasad-janya) book.' This distinction, as explained in Chapter 0, comes from the presence of Guru's grace, without which it is difficult to create such a work. This quality ensures it leaves a lasting impression on seekers and inspires faith, trust, and daily study through Parayans.