Do not you yet understand, that whatever enters in at the mouth goes into the belly, and is cast out into the draught?…
He plainly tells us that the part of human nature which yields such poisonous fruit is not a bough which may be sawn off, a limb which may be cut away, but the very core and substance of the man — his heart. He in effect tells us that lust doth not come out of the eye merely, but from the inmost nature of a depraved being. Murder comes not in the first place from the hasty hand, but from a wild ungovernable heart.
(C. H. Spurgeon.)
Parallel VersesKJV: Do not ye yet understand, that whatsoever entereth in at the mouth goeth into the belly, and is cast out into the draught?