I guess the answer lies in being irrational' with the Scriptures. There are not degrees of rationality. Something is logical, or it is not. An argument is sound, or it is not. The way people can identify rationality and still have some response with the Scripture is to shift to intuition.
Intuition deals with feelings.
Often men try to feel within themselves for what is right. Not far down the street are those who try to feel from the Scriptures what might seem to be right. These efforts are designed to take us away from a proper response of what the Bible authorizes to attempting to come to an extra-biblical conclusion. Fourth, this method cannot handle non-narrative books. Some push to preach Jesus when all they want is to abolish doctrine.