Matthew 5:13-16 - The Sermon On The Mount: Salt And Light
13 Ye are the salt of the earth: but if the salt become insipid, with what can it be salted? it is of no farther use for any purpose, but to be cast out, and trodden under foot of men.
14 Ye are the light of the world. A city cannot be hid that is situated on an eminence. 15 Neither do men burn a lamp, and set it under a bushel, but on its stand; and it sheds light on all that are in the house. 16 Just so let your light shine before men, that they may see your good works, and glorify your Father who is in the heavens.