[Here's a story] from Ellsberg's book Secrets. The setting is a meeting with Henry Kissinger in late 1968. In 1968 Ellsberg was a highly respected analyst ... who had worked for both the Pentagon and Rand, and Kissinger was just entering the government. Ellsberg told him, Henry, there's something I would like to tell you. You've dealt a great deal with top secret information. But you're about to receive a whole slew of special clearances, maybe fifteen or twenty of them, that are higher than top secret. First, you'll be exhilarated by some of this new information. But second, ... you will feel like a fool for having studied, written, talked about these subjects, criticized and analyzed decisions made by presidents for years without having known of the existence of all this information. In particular, you'll feel foolish for having literally rubbed shoulders for over a decade with some officials and consultants who did have access to all this ... and you'll be stunned that they kept that secret from you so well. You will feel like a fool. Then, after you've ... become used to using what amounts to whole libraries of hidden information, ... you will forget there ever was a time when you didn't have it. You'll be aware only of the fact that you have it now and most others don't ... and that all those other people are fools. [In] a matter of two or three years - you'll eventually become aware of the limitations of this information. It's often inaccurate, and it can lead you astray. But that takes a while to learn. In the meantime ... you will deal with a person who doesn't have those clearances only from the point of view of what you want him to believe and what impression you want him to go away with. You'll have to lie carefully to him about what you know. In effect, you will have to manipulate him.