If a man has not Christ at the bottom, he is no Christian at all. But even where Christ is in a man and you may find him walking blamelessly, yet, if you speak to him of Christ, there is not an echo in his heart, though his life goes on smoothly. Christ at the bottom and a fair Christian walk at the top, and between these two, a hundred and fifty things that Christ has nothing to do with at all. His life is practically passed without Christ. This will not do. It is the terrible levity of the heart that goes on without Christ, until it becomes the highway of whatever the world pours into it.
J. N. Darby