"When Christ calls the apostles the salt of the earth, he means, that it is their office to salt the earth: because men have nothing in them but what is tasteless, till they have been seasoned with the salt of heavenly doctrine... The doctrine, which has been entrusted to them, is shown to be so closely connected with a good conscience and a devout and upright life, that the corruption, which might be tolerated in others, would in them be detestable and monstrous." -John Calvin and William Pringle, Commentary on a Harmony of the Evangelists Matthew, Mark, and Luke, Volume 1. What do you think Christ means when he calls us to "salt of the earth"?