'Darkness' in the Bible

Now this is the gospel message we have heard from him and announce to you: God is light, and in him there is no darkness at all.

If we say we have fellowship with him and yet keep on walking in the darkness, we are lying and not practicing the truth.

On the other hand, I am writing a new commandment to you which is true in him and in you, because the darkness is passing away and the true light is already shining.

The one who says he is in the light but still hates his fellow Christian is still in the darkness.

But the one who hates his fellow Christian is in the darkness, walks in the darkness, and does not know where he is going, because the darkness has blinded his eyes.