Darkness is Merely the Absence of Light

Salt never loses its flavor it just gets watered down so its not as intense.

Matthew 5:13-16
Disciples and the World
13 “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.
14 “You are the light of the world. A city set on a hill cannot be hidden;
15 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. 16 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."

Darkness is nothing its merely the absence of light.

Matthew 5:14-16
14 “You are the light of the world. A city set on a hill cannot be hidden;
15 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. 16 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."

Ecclesiastes 2:13
"And I saw that wisdom excels folly as light excels darkness."