“Diamonds 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)”

“Diamonds are to be found only in the darkness of the earth, and truth in the darkness of the mind. ”

“Look...at...me..." he whispered. The green eyes found the black, but after a second, something in the depths of the dark pair seemed to vanish, leaving them fixed, blank, and empty. The hand holding Harry thudded to the floor, and Snape moved no more.”

“He had found the one calm place in the midst of the storm, a quiet voice calling him to earth.”

“Filled with hope, Ico looked into Yorda's eyes. He felt like was looking into an hourglass, trying to pick through the grains of sand for some truth buried there long ago. He hadn't found anything yet, but the warmth of Yorda's hands in his told him that he was getting close.”

“Every lie is a poison; there are no harmless lies. Only the truth is safe. Only the truth gives me consolation - it is the one unbreakable diamond.”