Patricia Princehouse's friend:

It takes half a second for a baby to throw up all over your sweater. It takes hours to get it clean.

The Economist:

It costs terrorists nothing to send a threatening message. But landing a plane, swarming it with sniffer dogs, and checking all the passengers is immensely expensive.

Unfortunately, there is no easy response to this.

Everyone:

Terrorists terrorists terrorists terrorists terrorists terrorists terrorists.

Bruce Hoffman:

There will always be a fundamental asymmetry in the dynamic between insurgency and counterinsurgency.

Richard Hamming:

What appears to be a fault, often, by a change of viewpoint, turns out to be one of the greatest assets you can have.