You can read your Bible - any version you want - and if you are honest you will admit that it is either obedience or inward blindness. You can repeat Romans word for word and still be blind inwardly. You can quote all the Psalms and still be blind inwardly. You can know the doctrine of justification by faith and take your stand with Luther and the reformation and be blind inwardly. It is not the body of truth that enlightens; it is the Spirit of truth who enlightens.