…he also is as though covered by a mist, a cloud, a darkness that hides everything he does and hides everything that takes place within him.
Trans: Ira Progoff. The Cloud of Unknowing
And ‘when I speak of darkness’ the author of The Cloud of Unknowing says, it is ‘not the kind of darkness that is in your house at night when the candle is out.’ It is a darkness of a quite different kind. ‘I am referring he says, ‘to a lack of knowing. It is a lack of knowing that includes everything you do not know or else that you have forgotten, whatever is altogether dark for you because you do not see it with your spiritual eye. And for this reason It is not called a cloud of the air, but rather a cloud of unknowing that is between you and your God.'” (IV:18)
a meditative journey 
And insightful image to go with an insightful piece of writing.
My daughter introduced me to this book…interesting to learn that the author is an anonymous monk.