UN peacekeeping operations are now increasingly complex and multi-dimensional, going beyond monitoring a ceasefire to actually bringing failed States back to life, often after decades of conflict. The blue helmets and their civilian colleagues work together to organize elections, enact police and judicial reform, promote and protect human rights, conduct mine-clearance, advance gender equality, achieve the voluntary disarmament of former combatants, and support the return of refugees and displaced people to their homes.

I was an ordinary boy at school, a young man. In fact, what did the headmaster once say? "You're constantly challenging those in authority; questioning and challenging those in authority." Which was not really the way I saw it. I felt there were questions that had to be answered, and things that weren't quite right.

We can love what we are, without hating what, and who, we are not.

There is a certain tendency on the part of some Americans to treat the UN as a multilateralism à la carte where you pick and choose where it suits you and when it doesn't suit you, you pull back.

Contrary to popular belief, we do not face a choice between economy and ecology, It is often said that protecting the environment would constrain or even undermine economic growth. In fact, the opposite is true: unless we protect resources and the earth's natural capital, we shall not be able to sustain economic growth.

I think over time you learn to know a bit more about yourself - you develop a certain amount of self-insight and self-awareness, and you know what you can absorb, and what you cannot; what gets to you and what doesn't.

On this International Day of UN Peacekeepers, let us pay tribute to the men and women from countries across the world who serve selflessly, tirelessly and fearlessly in UN peacekeeping operations. Let us remember the heroes who have laid down their lives in lands far from their own in the service of peace. And let us reaffirm our commitment to building a world free from the scourge of war.