The light of the body is the eye: if therefore your eye be single, your whole body shall be full of light.
We are told that rope dancers, in order to steady themselves during their perilous feats, are in the habit of fixing their gaze steadily on some distant object, and that, if once they permit themselves to look upon the rope, or upon the sea of upturned faces beneath them, then they become dizzy and fail. If you ever tried to cross a stream on a log, you will remember that, by looking steadily at some object on the opposite bank, you were quite safe; but, no sooner did you begin to look at the log, or upon the foaming, dashing waters beneath, than you lost your balance and came to grief. And, in order that our conduct may be right, that in this world, so full of snares, and temptations, and pitfalls, we may walk aright, it is absolutely necessary that we fix our affections upon one object, and that object is Christ.
Parallel VersesKJV: The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light.