Ideals survive through change. They die through inertia in the face of challenge.

The spread of freedom is the best security for the free.

We, therefore, here in Britain stand shoulder to shoulder with our American friends in this hour of tragedy, and we, like them, will not rest until this evil is driven from our world.

I think, there is a possibility - I would say it's more than that - that we will come to a view of foreign policy going forward that learns from the past but doesn't get captured by it.

The threat today is not that of the 1930s. It's not big powers going to war with each other. The ravages which fundamentalist political ideology inflicted on the 20th century are memories. The Cold war is over. Europe is at peace, if not always diplomatically.

I think people think their incomes have been flat lining for a long period of time. They feel that the next generation's opportunities are not going to be improvement. So and I also think that social media then allows insurgent movements to gain scale at speed.

I say to the Taliban: surrender the terrorists; or surrender power. It's your choice.