And God said, “Let there be light,” and there was light. And God saw that the light was good. And God separated the light from the darkness. God called the light Day, and the darkness he called Night. And there was evening and there was morning the first day.

– Genesis 1:3-5

God called the light good. but he didn’t call the dark good. The dark is not good. The dark can have no place with the light. Light casts out the dark, by nature.

Yet God made the light to shine during the day, but not at night. So a system which cycles and reveals good and evil. Yet Adam and Eve did not know the darkness until after they ate of the fruit of the tree, saw the darkness within themselves, and hid from the presence of God when he came, knowing that their darkness would be exposed by his light. And the LORD gave them leaves to hide their nakedness (darkness?).

Light will dispel darkness.

God sent The Light into the world to come into us and give us light.

5 This is the message we have heard from him and proclaim to you, that God is light, and in him is no darkness at all. 6 If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth. 7 But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin. 8 If we say we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. 10 If we say we have not sinned, we make him a liar, and his word is not in us.

1 John 1:5-10