Jeanette Winterson said this quote

I could have been a priest instead of a prophet. The priest has a book with the words set out. Old words, known words, words of power. Words that are always on the surface. Words for every occasion. The words work. They do what they're supposed to do; comfort and discipline. The prophet has no book. The prophet is a voice that cries in the wilderness, full of sounds that do not always set into meaning. The prophets cry out because they are troubled by demons.