“You are the salt of the earth; but if the salt has become tasteless, how can it be made salty again? It is no longer good for anything, except to be thrown out and trampled under foot by men.“You are the light of the world. A city set on a hill cannot be hidden;nor does anyone light a lamp and put it under a basket, but on the lampstand, and it gives light to all who are in the house.“Let your light shine before men in such a way that they may see your good works, and glorify your Father who is in heaven.
John 12:35–36 (NASB95)
So Jesus said to them, “For a little while longer the Light is among you. Walk while you have the Light, so that darkness will not overtake you; he who walks in the darkness does not know where he goes.
“While you have the Light, believe in the Light, so that you may become sons of Light.”
Genesis 1:3–4 NASB95
Then God said, “Let there be light”; and there was light.God saw that the light was good; and God separated the light from the darkness.