“Then the Interpreter took Christian by the hand and led him into a very large parlor that was full of dust because it was never swept. After He had reviewed it a little while, the Interpreter called for a man to come and sweep. Now when he began to sweep, the dust began to fly about so much and was so thick that Christian almost choked. Then said the Interpreter to a damsel who stood nearby, "Bring water, and sprinkle the room." When she had done as requested, it was swept and cleansed very pleasantly.
Then Christian asked, "What does this mean?"
The Interpreter answered, "This parlor is the heart of a man that has never been sanctified by the sweet grace of the gospel; the dust is his original sin and inward corruptions that have defiled the whole man. The first man that began to sweep is the Law; the damsel that brought water and sprinkled it is the gospel. You saw that as soon as the first man began to sweep, the dust filled the room
so thickly that it could not be cleansed, and you almost choked on it. This is to show you that the Law, instead of cleansing the heart from sin, actually revives, increases, and adds strength to it. Even though the Law uncovers and forbids sin, it is powerless to conquer or subdue”