'Light' in the Bible

And this is the message that we have heard from Him, and announce to you, that God is light, and darkness in Him is not at all;

and if in the light we may walk, as He is in the light -- we have fellowship one with another, and the blood of Jesus Christ His Son doth cleanse us from every sin;

again, a new command I write to you, which thing is true in him and in you, because the darkness doth pass away, and the true light doth now shine;

he who is saying, in the light he is, and his brother is hating, in the darkness he is till now;

he who is loving his brother, in the light he doth remain, and a stumbling-block in him there is not;