What kind of books are these?

There are books in this world intended for one person to read or understand them. Like the Seven Seal Scroll; Only the Lord is able to read or even open it, but there are other books like it. Even I’ve written a read like such. In a world where even angels will tell you,” There is no such thing as a coincidence.” well in this case like a time traveler destine to relive a past life because of” Unfinished Business”, reminds me of someone I know. The reason I confessed my past is because; in order to understand my future, you also must also understand my past as well. And that my future depends on me fulfilling that past. There are many reasons why most travelers from the future don’t come back to themselves directly, the main reason is that they are only able to drop crumbs like myself. The guide is not my only clue; Odd Thomas, or even songs, like one from Casting Crowns. A wave tossed in the ocean, a vapor in the wind; It’s all information about events or ideas about things only I know about. A simple highway, a jacket, and two twin cities in both Alabama and Georgia. And my list goes further. But I’m not going to remotely try to explain here, first of all it’s not for other people to understand, like John. To keep on subject, what are these documents called when they are only intended for one person?