'Dense' in the Bible

In the twilight, in the evening;In the black and dark night.

“Through your servants you have taunted and defied the Lord,And you have said, ‘With my many chariots I have gone up to the heights of the mountains,To the remotest parts of Lebanon.I cut down its tallest cedars and its choicest cypress trees;And I will go to its remotest height, its most luxuriant and thickest forest.

“For in fact, darkness will cover the earthAnd deep darkness will cover the peoples;But the Lord will rise upon you [Jerusalem]And His glory and brilliance will be seen on you.

But if your eye is bad [spiritually blind], your whole body will be full of darkness [devoid of God’s precepts]. So if the [very] light inside you [your inner self, your heart, your conscience] is darkness, how great and terrible is that darkness!