You are salt for the earth. But if salt loses its taste, what can make it salty again? It is good for nothing, and can only be thrown out to be trampled under people’s feet.
You are light for the world. A city built on a hill-top cannot be hidden.
No one lights a lamp to put it under a tub; they put it on the lamp-stand where it shines for everyone in the house.
In the same way your light must shine in people’s sight, so that, seeing your good works, they may give praise to your Father in heaven.
– Matthew 5:13-16