“You are the salt of the earth. But if the salt loses its flavour, what will be used to restore it? Only to be thrown out and trodden under foot by men.” (Matthew 5:13)
“You are the light of the world. A city that is on a mountain cannot be hidden, and a lamp is not lit and put under a bushel, but on a lampstand, and it gives light to all who are in the house” (Matthew 5:14-15).
“By this shall all men know that you are my disciples, if you have love for one another” (John 13:35).