'Light' in the Bible

For God who said, "Out of darkness let light shine," is He who has shone in our hearts to give us the light of the knowledge of God's glory, which is radiant on the face of Christ.

For this our light and transitory burden of suffering is achieving for us a preponderating, yes, a vastly preponderating, and eternal weight of glory;

Do not come into close association with unbelievers, like oxen yoked with asses. For what is there in common between righteousness and lawlessness? Or what partnership has light with darkness?

And no wonder. Satan, their master, can disguise himself as an angel of light.