How many people do you know live in darkness? I don't just mean spiritual darkness but natural darkness. How many people do you know live in a total absence of Light? I would guess that you know very few, if any, the problem is that things cant grow properly without light. Now from a Churchy point of view God has called his people to be light. Matthew 5 vs 14
"Here's another way to put it: You're here to be light, bringing out the God-colors in the world. God is not a secret to be kept. We're going public with this, as public as a city on a hill."
Before we get to that point we need to have seen the light, we need to have been in that point where God can show us his amazing light, I don't want to be dead before I see that light, its a challenge we all must face, to deny God is to deny the light to shine. to accept and Love God is to lay down our lives for His kingdom for His light to shine through us.