According to the preface, what is the indispensable role of a Guru's grace in the creation of a spiritual text like the Shri Sai Satcharita?

The preface in Chapter 0 clearly states that a Guru's grace is the most indispensable element in creating a lasting spiritual work. It explains that a book relying solely on scholarship and intelligence, without the qualities of inspiration, grace, or divine gift, will not endure or impress seekers. The text explicitly says, "Without Guru's grace, no matter how much scholarship one has, it is difficult to create a work like the current one." The Shri Sai Satcharita is presented as the definitive example of a "grace-filled" book, being the direct fruit of Baba's grace upon its author. This divine blessing is what gives the book its power and ensures it will be cherished by devotees.