A good writer is an expert on nothing except himself. And on that subject, if he is wise, he holds his tongue.

Agents of disruption, subversion, sabotage and disinformation tunnelers and smugglers, listeners and forgers, trainers and recruiters and talent spotters and couriers and watchers and seducers, assassins and balloonists, lip readers and disguise artists.

You can't make war against terror. Terror is a technique of battle. It's a tactic that has been employed since time immemorial. You can conduct clandestine action against terrorists, and that must be done.

I taught principally German language and literature at Eton. But any master with private pupils must be prepared to teach anything they ask for. That can be as diverse as the early paintings of Salvador Dali or how bumblebees manage to fly.

For decades to come the spy world will continue to be the collective couch where the subconscious of each nation is confessed.

A good writer can watch a cat pad across the street and know what it is to be pounced upon by a Bengal tiger.

What do you think spies are: priests, saints and martyrs? They're a squalid procession of vain fools, traitors too, yes; pansies, sadists and drunkards, people who play cowboys and Indians to brighten their rotten lives.