You are the salt of the earth: but if the salt have lost its savor, how shall it be salted? it is then good for nothing, but to be cast out and trodden under foot of men. You are the light of the world. A city set on a hill cannot be hid. Neither do men light a lamp, and put it under the bushel, but on the stand; and it shine unto all that are in the house. Even so let your light shine before men; that they may see your good works, and glorify your Father who is in heaven. (Matt. 5:13-16 ASV)