What qualities make the Shri Sai Satcharita an enduring and impactful spiritual text, according to its preface?

According to the preface detailed in Chapter 0, the Shri Sai Satcharita is considered an impactful and eternal text because it is a 'grace-filled' (Prasad-janya) book. It argues that works based solely on scholarship without a Guru's grace lack inspiration and will not last. The Satcharita's endurance comes from being a fruit of Baba's grace upon Annasaheb. This divine quality ensures it leaves a deep impression on seekers, inspires faith, and encourages daily study through Parayans and Saptahs.