Can a spiritual text effectively inspire devotion if it's written without a Guru's grace?

The source material strongly suggests that a spiritual book cannot be truly effective without a Guru's grace. Chapter 0 explains that poetic books written solely on the strength of scholarship and intelligence are considered 'artificial' and will not last eternally. For a book to leave a lasting impression on seekers and instill faith, it must have the qualities of inspiration, grace, and divine gift. The text emphasizes that without Guru's grace, creating such a work is difficult. The Shri Sai Satcharita is considered a 'grace-filled (Prasad-janya) book' precisely because it is the fruit of Baba's grace upon the author.