Matthew 5:13-16 - The Sermon On The Mount: Salt And Light
13 Ye are the salt of the earth; but if the salt have become insipid, wherewith shall it be salted? It is no longer fit for anything but to be cast out and to be trodden under foot by men.
14 Ye are the light of the world: a city situated on the top of a mountain cannot be hid. 15 Nor do men light a lamp and put it under the bushel, but upon the lamp-stand, and it shines for all who are in the house. 16 Let your light thus shine before men, so that they may see your upright works, and glorify your Father who is in the heavens.