'Darkness' in the Bible

The Lord said these things to your entire assembly at the mountain from the middle of the fire, the cloud, and the darkness with a loud voice, and that was all he said. Then he inscribed the words on two stone tablets and gave them to me.

Then, when you heard the voice from the midst of the darkness while the mountain was ablaze, all your tribal leaders and elders approached me.

You will feel your way along at noon like the blind person does in darkness and you will not succeed in anything you do; you will be constantly oppressed and continually robbed, with no one to save you.