I think it is vitally important to study History. If we are going to lead Britain safely into the future, it is essential that we understand our country's historical roots. If we can learn the lessons of the past, we will be able to avoid making mistakes in the future.

Bill Clinton has been a true leader of the western world. He has been a friend and a counsel to me and other leaders right around the world.

For me, 9/11 was a game changer. It altered my perception of the security threat we faced. I took the position that Britain should be shoulder to shoulder with the U.S. It was a big decision; I didn't take it lightly, or in ignorance of its consequences. It's a big commitment for a country to give, but I believed it was the right thing to do.

When my parents were growing up the world's population was under three billion. During my children's lifetime, it is likely to exceed nine billion. You don't need to be an expert to realise that sustainable development is going to become the greatest challenge we face this century

Our ultimate weapon is not our guns but our beliefs...The spread of freedom is the best security for the free. It is our last line of defense and our first line of attack.

I think the journey for a politician goes from wanting to please all the people all the time, to a political leader that realises in the end his responsibility is to decide. And when he decides, he divides.

I think most people who have dealt with me think I'm a pretty straight sort of guy, and I am.