Darkness simply cannot exist in the presence of light

I am the light of the world. Whoever follows me will not walk in darkness, but will have the light of life. (John 8:12 ESV)

 There was once a dark cave deep in the earth that had never seen light and couldn’t imagine what it might be like. One day, the sun sent the cave an invitation to come up and visit. When the cave did so, it was amazed and delighted and wanted to return the kindness, so it invited the sun to come down to visit it sometime, because the sun had never seen darkness. But when the sun arrived and entered the cave with curiosity at what “darkness” would be like, it was puzzled, and said, “I don’t see any difference!”
 The world can seem a pretty dark place at times—a loved one going through a scary illness, a child struggling with bullying, a story on the news about a tragedy or natural disaster. Darkness can also enter our relationships through bitterness, resentment, the feeling of being misunderstood, or the refusal to try to understand.
 But what the story of the cave shows is that darkness simply cannot exist in the presence of light. The most oppressive darkness is helpless in the presence of the light. “The light shines in the darkness, and the darkness can never extinguish it.” (John 1:5)
 “You are the light of the world” Jesus, who is the light of the world, in turn calls His followers the light of the world. That’s pretty awesome, but it’s also a challenge. No matter how dark the world may seem at times, it is both our responsibility and privilege to shine His light into the darkest corners of the world. —Ronan Keane [1]

Hope is being able to see that there is light despite all of the darkness. —Bishop Desmond Tutu

[1] Activated Light vs. Dark