Darkness in the Bible is often used as a metaphor for sin and fallen nature. Adam and Eve had moral and spiritual light before the Fall. When sin entered the world the connection with God was lost. They were now enslaved to their fallen nature. They were lost in the darkness of their sinfulness. The reason Jesus came into the world was to take away this darkness caused by sin. He came into the world to be a light.
Jesus has been compared to a lighthouse. The lighthouse shines in the darkness showing the way home. Jesus has come that we will no longer be in the darkness. That we might be set free from our slavery to sin.
Are you still walking in darkness? Are you still enslaved to your sinful nature? Do you understand that Jesus came to set you free from your sin? Jesus has come to be a light to show us the way to God and salvation. Be in the light!
Consider: 1 John 1:5-10