'Obscurity' in the Bible

Now in that day Tyre will be forgotten for seventy years, like the days of one king. At the end of seventy years it will happen to Tyre as in the prostitute’s song:

On that day the deaf will hear the words of a book,And out of their gloom and darkness the eyes of the blind will see [the words of the book].

And if you offer yourself to [assist] the hungryAnd satisfy the need of the afflicted,Then your light will rise in darknessAnd your gloom will become like midday.

Therefore justice is far from us,And righteousness does not overtake us.We [expectantly] hope for light, but only see darkness;We hope for gleam of light, but we walk in darkness and gloom.