'Light' in the Bible

and [if you] are confident that you are a [qualified] guide to the blind [those untaught in theology], a light to those who are in darkness,

The night [this present evil age] is almost gone and the day [of Christ’s return] is almost here. So let us fling away the works of darkness and put on the [full] armor of light.

Let us conduct ourselves properly and honorably as in the [light of] day, not in carousing and drunkenness, not in sexual promiscuity and irresponsibility, not in quarreling and jealousy.