We salt babies, don't we. Babies were salted to purify them. In other words, salt is sort of like peroxide. It's an antiseptic. It Kills germs fast.
Christians ought to purify the world.
The world ought to be a pure place because of you. My family has been salted with fire a lot lately. We feel that. But we are not the Pepper shaker of the world. Here salt is a symbol of the final Judgment.