In the beginning the Word already existed. The Word was with God, and the Word was God.
. . .
The Word gave life to everything that was created, and his life brought light to everyone. The light shines in the darkness, and the darkness can never extinguish it.
— John 1:1, 4-5 NLT
God's eternal relationship as Father, Son, and Spirit brought us the incarnation of God in human flesh through Jesus, God's ultimate message, "the Word"!  The power of this light-giving and life-giving Word cannot be extinguished, though hell has tried.  Darkness cannot overpower God's true Light  that shines to bring hope and joy to all of our lives and to deepen the meaning of our relationships. As we open our hearts to Jesus, He directs us to share His light with others. He said it this way:
"You are the light of the world. A town built on a hill cannot be hidden. Neither do people light a lamp and put it under a bowl. Instead they put it on its stand, and it gives light to everyone in the house. In the same way, let your light shine before others, that they may see your good deeds and glorify your Father in heaven." 
Shining our light is not only part of our relationship with others, but it also reflects our relationship with God!