Genesis 1:3-4—And God said, Let there be light: and there was light. And God saw the light, that it was good: and God divided the light from the darkness.
In the beginning, God… and the Spirit of God… and God said (the Word of God). Right in the first three verses, we have God the Father, the Holy Spirit, and the Son. God is light and in Him is no darkness at all. We can understand the eternal Godhead by what we see in creation. Wherever the light goes, the darkness flees. God has always had an illustration of those which are His, separated from the darkness. Ephesians 5:8 (NIV) For you were once darkness, but now you are light in the Lord. Live as children of light. The Scriptures call us children of the light, of the day and not of the night. Those who love truth come to the light. They come so that the darkness in them will flee and every space will be filled with light. Is every area of your life open to the Light? Do you readily come to the Light to be sure that there is no darkness in you? Allow the Lord access to every area of your life so that you may be full of light. We are in the world but not of the world. If we are filled with light, we should be causing the darkness around us to flee, not being overcome by the darkness. Be not overcome of evil, but overcome evil with good. (Romans 12:21 KJV)