“We don't know if capital punishment is a deterrent, but we know that men we execute will not murder again.”

“As we gain information we are more likely to focus on what we don't know :" Someone who knows the state capitals of 17 of 50 states may be proud of her knowledge. But someone who knows 47 may think of herself as not knowing 3 capitals”

“Now, on the subject of deterrence, I admit that there can be little doubt that as presently administered in the United States, the death penalty is not a general deterrent to murder in many, if not most, situations. . . .But of one thing I am certain: it is, by God, a specific deterrent. No one who has been executed has ever taken another innocent life. And until such time as we really mean it as a society when we say ‘imprisonment for life,’ I, and the families of countless victims, would sleep better at night knowing there is no chance that the worst of these killers will ever again be able to prey on others. Even then, I personally believe that if you choose to take another human life, you ought to be prepared to pay with your own.”

“You know why I think we still execute people? Because, even if we don't want to say it out loud-for the really heinous crimes, we want to know that there's a really heinous punishment. Simple as that. We want to bring society closer together-huddle and circle our wagons-and that means getting rid of people we think are incapable of learning a moral lesson. I guess the question is: Who gets to identify those people? And what if, God forbid, they got it wrong?”

“We don't know what we don't know.”

“And for once, Donald Rumsfeld, in the news at the time over the Iraq war made sense to me: "As we know," he said, famously, "there are known knowns-things we know we know. We also know there are known unknowns-things we know we don't know. But there are also unknown unknowns- things we don't know we don't know.”