High office teaches decision making, not substance. It consumes intellectual capital; it does not create it. Most high officials leave office with the perceptions and insights with which they entered; they learn how to make decisions but not what decisions to make.

Everybody has a hacking capability. And probably every intelligence service is hacking in the territory of other countries. But who exactly does what? That would be a very sensitive piece of information. But it's very difficult to communicate about it. Because nobody wants to admit the scope of what they're doing.

Diplomacy: the art of restraining power.

For other nations, utopia is a blessed past never to be recovered; for Americans it is just beyond the horizon.

I am about to be married, and am of course in all the misery of a man in pursuit of happiness.

Nothing prevents happiness like the memory of happiness.

How often we fail to realize our good fortune in living in a country where happiness is more than a lack of tragedy.

Work faithfully, and you will put yourself in possession of a glorious and enlarging happiness.