Without salt, meat and fish would quickly spoil. In a similar way, Christians who uphold God's moral standards can slow the decay of society. Salt was also used as fertilizer. Until the mid-1900s, English farmers added salt to their fields to increase the yield. Salt helped crops to grow.
Christians too can encourage the growth of what is good wherever they live.
Salt also brings out the flavor of food. By their witness, salty believers help the people around them to taste life fully as God intended. Yet Jesus warned that salt can lose its flavor. Pure salt as we know it, made up of sodium chloride, can't lose its taste. In ancient Israel, however, farmers would dig salt from the shores of the Dead Sea.