Matthew 5:13-20
You are salt and light (5:13-14; see also Mark 9:50; Luke 14:34-35). Unless your righteousness exceeds... (5:17-20). "You are the salt of the earth, but if the salt has lost its flavor, with what will it be salted? You are the light of the world. Let your light shine before men; that they may see your good works, and glorify your Father who is in heaven."