tabe tara disa sphure mo-nicera hrdaya
isvara tumi,--ye karaha, sei siddha haya"
tabe—if you do so; tara—of that; disa—the process of writing; sphure—manifests; mo-nicera—of someone lowborn like me; hrdaya—in the heart; isvara tumi—You are the Supreme Personality of Godhead; ye karaha—whatever You cause to do; sei siddha haya—that is perfectly done.
"If You would please manifest Yourself within my heart and personally direct me in writing this book, then, although I am lowborn, I may hope to be able to write it. You can do this because You are the Supreme Personality of Godhead Yourself, and whatever You direct is perfect."
Link to this page: https://prabhupadabooks.com/cc/madhya/24/327