Ephesians 5:8: “For you were once darkness, but now you are light in the Lord. Live as children of light.”
People can be put into two categories: children of darkness or children of light. You automatically belong to one of these groups. If you have not been born again you are still in the darkness. If you reconciled yourself with God by means of Jesus Christ you have become a child of God and you are in the light now. The word of God encourages you to behave as a true child of light and if you haven’t become one yet ask Jesus to save you and change your nature.