"If the Light of the World lives in you" - can be also interpreted as "If the God of the all creation lives in you"
"And so we shine while this moment slips away from us
Shine while the skies are turning gray
And so we shine like there's nothing they can take from us
We want no one left behind" - the most important part of the song, telling how he found faith in God, shine even though you are surrounded by evil
This song is apparently about God and faith.
"If the Light of the World lives in you" - can be also interpreted as "If the God of the all creation lives in you"
"And so we shine while this moment slips away from us Shine while the skies are turning gray And so we shine like there's nothing they can take from us We want no one left behind" - the most important part of the song, telling how he found faith in God, shine even though you are surrounded by evil