You are the salt of the earth; but if the salt loses its flavor, how shall it be seasoned? It is then good for nothing but to be thrown out and trampled underfoot by men. (Matthew 5:13, NKJV)
Have you heard the expression, “he’s not worth his salt?” It comes from the days of the Roman Empire. “A soldier’s pay—consisting in part of salt—came to be known as solarium argentum, from which we derive the word salary. A soldier’s salary was cut if he “was not worth his salt,” a phrase that came into being because the Greeks and Romans often bought slaves with salt” (“A Brief History of Salt,” Time, March 15, 1982). Salt flavors and preserves food. It made a useful antiseptic before modern medicine. Israel offered salt in its offerings to God, perhaps as a token that their sacrifices were seasoned and preserved by the Sinai covenant (Lev. 2:13). Jesus said His followers are the salt of the earth, a timeless and easily understood metaphor. Christians (citizens of the kingdom of heaven), must be influences of righteousness in a world of sin and death. Our lives must flavor the world around us, influencing others to turn to God. We must guard ourselves against sin because it destroys godly influence. As contaminated salt lost its usefulness to flavor food and to disinfect was cast onto the foot trails (to avoid destroying fertile soil), the Christian who loses his godly influence is ineffective (even destructive) to the cause of Christ. A godly influence is needed and powerful. Protect your influence and season the world with righteousness (Eph. 4:20-24).