We can only imagine what the end of greed, and selfish pursuit, and corruption unleashed would look like. It would be unbearable. Maybe comparable to a meal without salt. All your meals without salt. After tasting salt and enjoying it without conscious thought of its presence.
Salt also is a preservative.
In the time before refrigeration, it was used on meats and fish to slow or stop the rotting or degradation process. In this way, Christ's presence in this world stops the degradation of the world. To add Salt to this world also has a healing affect. Salt also stings when it touches bare flesh. This is a reminder of those who do not know of the healing power of God.