Separating the light from the darkness.
In Genesis we see God creating light before He created the sun the moon and the stars. John Chapter One begins just like Genesis One. "In the beginning" John also speaks about the light; "The light shines in the darkness but the darkness has not overcome it.
We see the Word being the life and light of men. The Word being present and active in creation brings a separation from the darkness. When we believe in Him we too have a new beginning. He brings His light to dwell in us, to search our heart and overcome the darkness of our fallen hearts. He enables us to walk in the light of day, keeping us from stumbling, giving a right and true perspective to our thoughts. He begins to evaporate the dark thoughts that once plagued us and fills our new
heart with a song of praise when we feel alone or fearful.
He has won us out of the clutches of darkness and brought us into His Kingdom of light where there is no need for the sun and moon to shine on it - for the glory of God gives it light, and the Lamb is its lamp. Revelation 21:23