homo unius libri

I have thought I am a creature of a day, passing through life as an arrow through the air. I am a spirit come from God and returning to God; just hovering over the great gulf, till a few moments hence I am no more seen. I drop into an unchangeable eternity! I want to know one thing, the way to heaven–how to land safe on that happy shore. God himself has condescended to teach the way: for this very end he came from heaven. He hath written it down in a book. O give me that book! At any price give me the Book of God! I have it. Here is knowledge enough for me. Let me be homo unius libri [a man of one book].
John Wesley, “Preface to Sermons on Several Occasions”

then who can repent?

Fallen man is not simply an imperfect creature who needs improvement: he is a rebel who must lay down his arms…This process of surrender–this movement full speed astern–is what Christians call repentance. Now repentance is no fun at all. It is something much harder than merely eating humble pie. It means unlearning all the self-conceit and self-will that we have been training ourselves into for thousands of years. It is killing part of yourself, undergoing a kind of death. In fact, it needs a good man to repent. And here comes the catch. Only a bad person needs to repent: only a good person can repent perfectly. The worse you are the more you need it and the less you can do it. The only person who could do it perfectly would be a perfect person–and he would not need it.
–C.S. Lewis, Mere Christianity