God made the two great lights, the greater light to govern the day, and the lesser light to govern the night; He made the stars also. Genesis 1:16
Often when referring to the spiritual state of a person we relate it to walking in darkness (night) or walking in the light (day). This is a good picture of where we stand because God is light (1 John 1:5) and because through Christ we have a new life we want to walk in the light with Him (Ephesians 5:8). However the wicked practice their evil deeds in darkness because they hate the light(John 3:19). They know that what they are doing is wrong and do not want to be exposed (John 3:20).
My question then is this, why do the wicked hide from the light if they are in darkness and don't know truth? Why do they continue to say that there is no God when they would say murder is a crime? It's because even though they are in darkness there is still light there also. God made the night also and He made a "lesser light to govern [it]; He made the stars also." Every Sinner has some sense of Truth that God has given him. He has a conscience and therefore knows that some things are inherently wrong. God has also placed us, Christians, in the lives of the lost to be twinkling stars to them so they can see even a fragment of light. The sinner is without excuse; God has been merciful to him and yet he still practices wickedness thinking there is no one to see (Psalm 64:5)! Even what the lost person practices in the darkness is seen by God(Psalm 33:13).
With this in mind may we be the brightest stars in the sky so that men might see there sin and turn to the Lord!