In Him was life, and the life was the Light of men. The Light shines in the darkness, and the darkness did not comprehend it. (John 1:4-5 NASB)
When a candle is lit, it brightens up the whole room dispelling the darkness. In the same way as candlelight illuminates a room, Jesus is the Light of the whole World. His Light overcomes the darkness of evil and shines the truth for all to see.
What great news we have that there is nothing that can keep us from knowing Jesus. He is our life and He is our light.
"With Christ, darkness cannot succeed. Darkness will not gain victory over the light of Christ.” - Dieter F. Uchtdorf