Hence he concludes, The people, then, labor in the fire, and the people weary themselves in vain. To labor in the fire means the same thing as to take in hand an unprofitable work, the fruit of which is immediately consumed. Some say that people labor in the fire, because Babylon had been built by a great number of men, and at length perished by fire; but this explanation seems far-fetched. I take a simpler view—that people labor in the fire, like him who performs a work, and a fire is put under it and consumes it; or like him, who with great labor polishes his own work, and a fire is prepared, which destroys it while in the hands of the artificer. For it is certain that the Prophet repeats the same thing in another form, when he says, בדי-ריק, bedi-rik, with vanity, or for vanity. We now then apprehend his object.