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Spying is a like a game of chess: Sometimes you have to withdraw, sometimes you have to sacrifice one of your pieces to win - preferably a knight rather than a king or queen.

Since real spies are so good, you never really know what actual spying is. But I do think spying is a lot more dangerous than we are led to believe.

We are moving rapidly into a world in which the spying machinery is built into every object we encounter.

We have some material on spying by a major government on the tech industry. Industrial espionage.

Spying among friends is never acceptable.

There will always be spies. We have to have them. Without them we wouldn't have got Osama bin Laden - it took us years, but it happened.

Once you've lived the inside-out world of espionage, you never shed it. It's a mentality, a double standard of existence.

The United States, like any great power, is always going to have an intelligence operation, and some electronic surveillance is obligatory in the modern world.

Ever since we've had electronic communications, and particularly during a time of war, presidents have authorized the electronic surveillance of the enemy.

Surveillance changes history. We know this through examples of corrupt presidents like Nixon.