'Darkness' in the Bible

This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.

If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth:

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.

He that saith he is in the light, and hateth his brother, is in darkness even until now.

But he that hateth his brother is in darkness, and walketh in darkness, and knoweth not whither he goeth, because that darkness hath blinded his eyes.