“You are the salt of the earth. But if the salt should lose its taste, how can it be made salty? It’s no longer good for anything but to be thrown out and trampled on by men.” Matthew 5:13
Salt is pretty important. Imagine what French fries would be like without salt. Or potato chips. In fact, a large portion of what we eat would taste awful without salt. The taste of salt, or lack thereof, is noticed immediately. If we were ever to put salt on our food to find it didn’t have taste, we would be disgusted and throw it out immediately. In the same way, our “taste” as Christians needs to be noticeable. If it isn’t, then we aren’t fulfilling our purpose.
But in Bible times salt was even more important. Being that the refrigerator was yet to be invented, salt was used as a preservative. If we are the salt of the world, we are what keeps it from rotting. Thus our job isn’t only to “add flavor” to the world here and there. When we see “rotting” parts of the world, such as suffering, we should take a stand against it and work to prevent it from continuing.