„I took that opportunity to tell him something that, er, I had long thought of telling somebody that was about to enter the world of really high secrecy. And I said, 'Henry, you're about to get a lot of clearence higher than top secret that you did not know existed. That's going to have a sequence of effects on you. First, a great exhileration that you're getting all this amazing information that you didn't know even existed. And the next phase is you'll feel like a fool for not having known about any of this. but that won't last long. Fairly soon, you'll come to think that everyone else is foolish. What would this expert be telling me if he knew what I knew? So in the end, you stop listening to them.“
— Daniel Ellsberg
On talking to Henry Kissinger about the effects of gaining high security clearence after Kissinger's first National Security Council with then president Nixon. 'The Most Dangerous Man in America - Daniel Ellsberg and the Pentagon Papers' 2009 Documentary.