'True Light' in the Bible

The man who first puts his cause before the judge seems to be in the right; but then his neighbour comes and puts his cause in its true light.

That was the true Light, which lighteth every man that cometh into the world.

Did then a thing which is good become death to me? No, indeed, but sin did; so that through its bringing about death by means of what was good, it might be seen in its true light as sin, in order that by means of the Commandment the unspeakable sinfulness of sin might be plainly shown.

Again, a new commandment I write unto you, which thing is true in him and in you: because the darkness is past, and the true light now shineth.