Mark 9:49-50

The conclusion of Christ's discourse: V. 49. For everyone shall be salted with fire, and every sacrifice shall be salted with salt. V. 50. Salt is good; but if the salt have lost his saltness, wherewith will ye season it? Have salt in yourselves, and have peace one with another.

This sacrifice, this continual working and bringing into subjection one's own members for the sake of Christ, is demanded by Christ in the interest of His purpose to make every Christian and the entire Christian Church a salt in this world. As every sacrifice of the Old Testament had to be salted, Lev. 2, 13, so every disciple, every believer, must be salted with fire.

Jesus does not refer, in this instance, to the fire of hell, but to the purifying fire of His rule and leading. It is the discipline of the Word and the Spirit of God which gradually cleanses the believers of sin, and kills the works and desires of the flesh, and the fire of tribulation, which renders sin and its results unpleasant, 1 Pet. 1, 4.

This fire incidentally performs the work of a salt, it prevents moral rotting and a relapse into the service of sin. And the Christians that have been sanctified by the Word and the Spirit of God and whose sanctification is progressing continually should have this salt with them always, in doctrine and admonition. They shall freely, as occasion offers, rebuke the false works of the world, instead of permitting the world to lead them into sin. But among themselves, one with another, they should maintain peace and not boastingly seek self-glorification.

The fact that the Gospel is a salt is brought out strongly by Luther in admonishing the Christians to be a true salt. "Where the salt loses its saltiness, and the Gospel is spoiled with doctrines of men, there the old Adam no longer can be spiced, there the worms will grow. But salt is sharp; therefore it is necessary to have patience and peace in the salt" (Luther, 8, 1839).

Summary. After the miracle of the transfiguration, Jesus heals a deaf-mute boy, gives His disciples information concerning their inability to cast this demon out, announces His Passion for the second time, and gives them a long discourse on service, humility, and on giving offense.