Revery, which is thought in its nebulous state, borders closely upon the land of sleep, by which it is bounded as by a natural frontier.
Victor HugoDiamonds are found only in the dark bowels of the earth; truths are found only in the depths of thought. It seemed to him that after descending into those depths after long groping in the blackest of this darkness, he had at last found one of these diamonds, one of these truths, and that he held it in his hand; and it blinded him to look at it. (pg. 231)
Victor Hugo